While applying the Amperes circuital law to find a magnetic field at a point outside a capacitor connected to a time-varying current, Maxwell noticed an inconsistency in the Amperes circuital law. The hand feels tired due to the weight of bucket. Using the basic laws of reflection and refraction, we shall study the image formation by plane and spherical reflecting and refracting surfaces. (i) Push: We close drawer by pushing. A blacksmith hammers a hot piece of iron while making a tool. Question 3. (a) To stretch the bow, the archer applies a force that causes a change in its shape. A difference in charge arises in different areas of the atom due to the uneven spacing of the electrons between the atoms. Answer: Slowly lower the manometer into the water. Caterpillar tracks are used in battle tanks instead of tyres to increase the area of contact. (b) Taking out paste from a toothpaste tube. TS Grewal Solutions Class 12 Accountancy; an ampere is the amount of current produced by the force of one volt acting through a resistance of one ohm. The ball stops due to An inflated balloon was pressed against a wall after it had been rubbed with a piece of synthetic cloth. 8. Question 7. In the following situations, identify the agent exerting the force and the object on which it acts. distance the ball comes to rest. Activity 6 (NCERT Textbook, Page 135) Towing cars and pulling buckets from wells are also examples of tension force. Finally, we will discuss the phenomenon of polarisation which is based on the fact that the light waves are transverse electromagnetic waves. Solution: This kind of chemical bonding existing between two unlike charged particles is known as an electrovalent bond. Atoms having eight electrons in their last orbit are stable and have no tendency to react. This action changes the motion of the box. Find the tension on the string. The sucker sticks to the surface because the pressure of the atmosphere acts on it. What is meant by force of gravitation ? muscular, contact, non-contact, gravity, friction, shape, attraction. Repeat the activity and try to obstruct the moving ball by placing the ruler such that it makes different angles to its path. Since broader straps have greater area, therefore, the pressure decreases. When the forces are repulsive in nature, the energy increases. 3. How does the force due to hammering affect the piece of iron ? The two forces are equal in magnitude but opposite in direction. Repeat this process a few more times. Carbon-oxygen bond lengths in carboxylate ion are equal due to resonance. Practising these types of questions in this chapter will ensure they have a good grasp of the subject. No, we do not feel the pressure of the atmosphere because air is present everywhere. Log In to Product g. (d) Agent is muscles of athlete, object is athlete himself and effect of the force changes the state of motion of the athlete. where A is the Hamaker coefficient, which is a constant (~10 19 10 20 J) that depends on the material properties (it can be positive or negative in sign depending on the intervening medium), and z is the center-to-center distance; i.e., the sum of R 1, R 2, and r (the distance between the surfaces): = + +.. Yes, the rubber tube bulge out and the bulging increases with the amount of water in the bottle. In Push force object moves away from the source of the force. How does the force due to hammering affect the piece of iron? Answer: They explained chemical bonding on the basis of the inertness of noble gases. Question 2. Take a pair of bar magnets. Question 8. Answer: Greater the bond order, shorter is the bond length. When the forces are attractive in nature, the energy decreases. 11.4). Question 17. When we run a small or tiny piece of paper with the oil in our head with the help of a comb produces electrostatic force. A stone is tied to a thread and moved in a circular path. We observed that different streams of a waterfall at the same distance from the bottle. In the present chapter, we shall study some of the basic laws concerning steady electric currents. Make sure that the water does not leak from the joint. A hydrometer can be used to determine the density of a liquid by measuring the level at which the hydrometer floats in it. Once we release the pressure on the bulb, water gets filled in the dropper. (b) decreases with depth Here we are providing Class 12 Physics Important Extra Questions and Answers Chapter 2 Electrostatic Potential and Capacitance. Give two examples each of the situations in which you push or pull to change the state of motion of objects. What will be the total force applied by them ? Press it hard on a smooth plane surface. Is it a contact force or non-contact force? Where is pressure greatest and the least inside a bottle filled with water. Due to this, the blood oozes out when we have a slight cut on our body. Hydrogen and fluorinegenerally occupy the terminal positions. Halogens can form negatively charged ions by gaining an electron. Answer: An object or a body at rest cannot change by itself. (a) Squeezing a piece of lemon between the fingers to extract its juice. You can do so by slightly heating one end of the glass tube and then quickly inserting it near the bottom of the bottle. In B the situation is just the opposite. Answer: Why does the rubber sheet fixed to the glass tube bulge this time? Forces acting on bucket are as follows: The reason behind this is the pulling forces can overcome the reaction force exerted by the cart somewhat easily than push force. (b), Question 8. (i) The box moves with difficulty when we push alone but moves easily if helped by our friend. You can take a used tin of talcum powder or a plastic bottle. Fix a cylindrical glass tube, a few cm long near its bottom as shown in Fig. This chapter explains the role of each element in details. Give two examples of situations in which applied force causes a change in the shape of an object. The basic requirement is that each bonded atom gets an octet of electrons. The muscular force changes the shape of the iron so that it can be given the desired shape. Bond enthalpy is usually expressed in KJ mol-1. The rise of water in the dropper is due to. (c) may move the object and also cause a change in its shape. The attractive force which holds various constituents (atom, ions, etc.) The low ionization energy of the atom forming the cation. Oxygen molecule exhibits paramagnetic nature indicating unpaired electrons. Access the Chapters NCERT Solutions for Class 8 of Science from the link provided below. JEE Main 2021 LIVE Chemistry Paper Solutions 24-Feb Shift-1 Memory-Based. Lightning phenomenon is also a common example of electrostatic force. sp3 orbitals are formed from the s -subshell with uniform electron distribution around the nucleus and of p-subshell with distribution in the three vertical axis. What do you observe? Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Physics related queries and study materials, Your Mobile number and Email id will not be published. A force which is applied only when it is in contact with an object is called a contact force. This delocalized bonding is a type of chemical bonding in which bonding pair of electrons are spread over a number of atoms rather than localized between two. It was found that the balloon sticks to the wall. By using our site, you Put your understanding of this concept to test by answering a few MCQs. [NCERT] If the atoms come more closer, repulsion starts and again the potential energy of the system begins to increase. Ampere is defined as the unit of electric current that is equal to the flow of one Coulomb per second. Question 2. To pull the sucker off the surface, the applied force should be large enough to overcome the atmospheric pressure. d) The feet of the athlete exert muscular force on the ground, which pushes the ground. Therefore, more force has to be applied. Pressure = Force/Area The general electronic configuration of noble gases (except helium) is given by ns. (c) A load suspended from a spring while its other end is on a hook fixed to a wall. (d) gravity, friction. And it is only then, you will be able to get good jobs or get placed directly from campus recruitment, conducted by colleges. When we press the bulb of a dropper with its nozzle kept in water, air in the dropper seems to escape in the form of bubbles. 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These forces occur due to a temporary charge imbalance arising in an atom. Answer: Force of gravity is a non-contact force. Does it stick to the surface? What is the Impact of E-Commerce on the Society? Gravitational force. together and stabilizes them by the overall loss of energy is known as chemical bonding. Electrostatic force. It is often referred to as Coulombs force. When this charged balloon is pressed against a wall, it sticks to the wall. Why is it comfortable to lift a school bag with broad straps than thin straps ? Answer: Question 18. The increased pressure may hurt the body of divers. (c) push What is meant by contact force ? Question 7. From the above actions, we can conclude that force can change the shape of an object. (i) Gravitational force of the earth (downward) Crossing a leg, moving from one position to another, etc. In other words, an atom is almost empty. The forces which change the shape of an object are as follows: i) By pressing the clay between the hands, it deforms. NCERT, Sri Aurobindo Marg, New Delhi-110016. The phenomenon of electromagnetic induction is not merely of theoretical or academic interest but also of practical utility. (d) While the arrow moves towards its target, the forces acting on it are due to __________ and that due to __________ of air. (a) magnetic force the orbitals containing the bonding electrons is called thebond angle. Question 3. Note your observations in Columns 4 and 5 of the table. This kind of chemical bonding existing between two unlike charged particles is known as an electrovalent bond. Question 13. The electric mains supply in our homes and offices is a voltage that varies like a sine function with time. This action changes the state of motion of the ball. After covering a short Fill in the blanks in the following statements. Question 6. They are one of the greatest barriers standing in the way of plans for interplanetary travel by crewed spacecraft, but space radiation health risks also occur for The amount of energy required to break one mole of bonds of a type so as to separate the molecule into individual gaseous atoms is calledbond dissociation enthalpy or Bond enthalpy. Problem 1: What are pull and push forces out of the following actions: Moving a book far from you, opening a door toward yourself, drawing a bucket of water from a well, a football player taking a penalty kick, a cricket ball hit by a batsman, Opening a drawer. The power of the circuit is given by the following formula: Rearranging the above equation, we can calculate the value of electric current as follows: The resistance of a circuit is calculated using the following formula: Rearranging the above formula, we can calculate the value of electric current as follows: The ammeter cannot be connected in parallel to the load because of its low resistance. The opposite also holds true; if the chemical bonding between the constituents is weak, the resulting compound would lack stability and would easily undergo another reaction to give a more stable chemical compound (containing stronger bonds). For Example, in methane, CH4molecule, there are 8 valence electrons (in which 4 belongs to carbon while other 4 to H atoms). Students must study these NCERT Solutions meticulously to excel in the subject. Magnetic force, i.e., the force exerted by a magnet on another magnet or a piece of iron. Observe what happens. Question 11. An electric current value can be lower than 0.01 A or higher than 1000 A. NCERT Solutions for Class 8 Science Chapter 11 Force and Pressure are provided here to help students to follow the concepts in an easy way. Walking, we are able to walk because there is friction, and we are walking at a certain low speed because of the opposing force provided by friction. Take a plastic bottle. Question 1. It is denoted by T. It is exerted in every falling object, small or big, thick or thin, whatever it is. [NCERT]. Question 9. For a covalent molecule AB, the bond length is given by d= ra+ rb. What would happen if you let your palm hold the moving ball? Along with answers to the textbook questions, these solutions have exemplary problems, worksheets, important questions and HOTS. Answer: Force can be defined as a push or pull on an object or body. Answer: The NCERT Solutions for Class 8 Science Chapter 11 from BYJUS are designed with the main aim of helping students to focus on important concepts. Contact force: The force which is applied by objects in contact with each other is called contact force. To stretch the bow, the archer applies a force that causes a change in its . To make it easier for them to learn, we are providing here solutions for all the students of 11th standard, such that, they can clarify their doubts for all types of questions. The two forces are equal in magnitude but opposite in direction. High electron gain enthalpy of the atom forming the anion. Take an empty plastic bottle or a cylindrical container. Another form of chemical bonding is caused by London dispersion forces. In very simple words, two objects or materials having charge with the same direction of motion have a magnetic attraction force between them while there exists some kind of opposite charges then they repel each other. Step 3:Using the chemical symbols of the combining atoms and constructing a skeletal structure of the compound, divide the total number of electrons as bonding shared pairs between the atoms in proportion to the total bonds. Students can easily find answers for any question here which is mentioned in the textbook. Solution: Where is the pressure greater, 10 m below the surface of sea or 20 m below ? Answer: The electrostatic force refers to attractive forces or repulsive forces between two charged tiny particles. Name the instrument used to measure atmospheric pressure. The rope will move towards side A as more force is applied by side A. The relationship between ampere and coulomb is represented as follows: At any given point in an area experiencing current, the Ampere value will increase proportionately if the charge on particles moving through it increases. (c) A load suspended from a spring while its other end is on a hook fixed to a wall. for anions, we add an electron to the valence electrons and for each positive charge i.e. b) To take out paste from the toothpaste tube, we use our muscular force. Is it possible that a force changes the direction of motion but not the speed of an object ? Take a good quality rubber sucker. [NCT 2008] However, it could not explain why atoms emit light of only discrete wavelengths. (a) pressure of water (b), Question 2. Studying the Effect of Force on Objects. Why ? When the external force is removed, the body moves, gaining kinetic energy and losing an equal amount of potential energy. It is determined experimentally by x-ray diffraction or electron diffraction method or spectroscopic method. Therefore, using these solutions students can really score good marks in their final exams. Further, electrical energy can also be transmitted economically over long distances. Question 3. Access the Chapters, Frequently Asked Questions on NCERT Solutions for Class 8 Science Chapter 11. Two forces apply to the particle, one is electrostatic force, and the other is weight force. The main reason for preferring use of ac voltage over dc voltage is that ac voltages can be easily and efficiently converted from one voltage to the other by means of transformers. Answer: No, muscular force can be applied only when it is in contact with an object. The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north. Force of gravitation (weight). For example, 2 A to milliampere is converted as follows: One Ampere is equal to 1000000 or 10-6 microamperes. Discuss why the forces acting on the bucket do not bring a change in its state of motion. Answer: All Chapter 2 - Electrostatic Potential and Capacitance Exercises Questions with Solutions to help you to revise complete Syllabus and boost your score more in examinations. A laser printer rapidly produces high quality text and graphics. Required fields are marked *, The subtopics covered under Chapter 11 of NCERT Solutions for Class 8 Science are. By using our site, you A push or a pull force also has direction; which means that it is a vector quantity if the magnitude or direction changes, it directly affects either type of force. Whenever we throw a rubber ball up, it falls to the ground due to gravitational force. Quantum mechanical properties of the Now bring one end of the other magnet near the end of the magnet placed on the rollers. Name the forces acting on a plastic bucket containing water held above ground level in your hand. The difference in the energies of the canonical forms and resonance hybrid is called resonance stabilization energy. Therefore, it can be understood that chemical compoundsare reliant on the strength of the chemical bonds between its constituents; The stronger the bonding between the constituents, the more stable the resulting compound would be. Name two types of contact forces. [NCERT] Answer: Is it easier to move it now? The game of tug war has two teams that apply pulling forces on each other. Take a large glass jar full of water. Which side will the rope move ? The force of attraction exerted by the earth on all objects is called the force of gravitation. You can take a discarded water or soft drink bottle. This action changes the state of motion of the bucket. In doing so, you would apply a force on the moving ball. Below we have listed examples of ampere conversions from one scale to another. If area is doubled keeping the force constant, then pressure becomes half. (a) A ball set in motion by pushing it along a level surface and We shall study how currents and voltages are detected by a galvanometer. One example has been given to help you. Non-Contact force: The force which is applied to an object by another object that is not in direct contact with each other is called Non-contact force. thanks a lot byjus website, Your Mobile number and Email id will not be published. On pressing the sucker, the air between the cup and the surface escapes out. Health threats from cosmic rays are the dangers posed by cosmic rays to astronauts on interplanetary missions or any missions that venture through the Van-Allen Belts or outside the Earth's magnetosphere. A blacksmith hammers a hot piece of iron while making a tool. The boat comes to rest when we stop rowing it due to the force of friction acting between the surface of water and the boat. Institutional Solutions Increase engagement, lower costs, and improve access for your students. A push or pull force may make an object move from rest. When two unbalanced forces act on a body, in opposite directions, the net force is equal to The sum of kinetic and potential energies is thus conserved. A camel is able to move fast on sand. Hybridized orbitals, hence have their electron distribution in three dimensions, as tetrahedral directions. The force of gravity is responsible for the weight of objects. Trucks intended to carry heavy loads have eight tyres, so as to increase the area of contact with the road. They have well prepared and structured solutions available here, by us. 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