SUBJECT : PHYSICS - SSA Punjab

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<strong>PHYSICS</strong> 10+2Unit 1 : Electrostatics2 marks questions1. Explain Quantisation and conservation of charge.2. Give the properties of electric charge.3. What is difference between charge and mass?4. What is dielectric constant? How does force gets affected when charges areplaced in vacuum?5. What are similarities and dissimilarities between Coulomb’s forces andGravitational forces?6. Why water has high dielectric constant?7. Two point charges q 1 and q 2 are such that q 1 q 2 > 0. What is the nature offorce between two charges?8. What is the effect on the electrostatic force between two charges if (a) adielectric slab is introduced between them (b) A metal slab is introducedbetween them9. What is principle of superposition of charges? What is its importance?10. Vehicles carrying inflammable materials usually have metallic ropestouching the ground during motion, why?11. How the mass of the body is affected on charging?12. How many electrons are present in one coulomb of charge?13. An electrostatic force between two charges is called central force. Why?14. Dielectric constant of water is 80. What is its permittivity?15. If the distance between two equal point charges is doubled and theirindividual charges are also doubled, what would happen to the force betweenthem?16. A comb run through one’s dry hair attracts small bits of paper. Why? Whathappens, if the hair is wet or it is a rainy day?17. Can a charged body attract another uncharged body? Explain.18. Can two balls having same kind of charge on them attract each other?Explain.19. A bird perches on a bare high-power line and nothing happens to the bird. Aman standing on the ground touches the same line and gets a fatal shock.Why?20. Find the ratio of the order of magnitude of electrostatic force to gravitationalforce.21. What is the effect on the electrostatic force between two charges if (a) adielectric slab is introduced between them (b) A metal slab is introducedbetween them22. In a medium, the force of attraction between two point electric charges.distance d apart is F. What distance apart should these be kept in the samemedium so that the force between them becomes30
a. 3Fb. F/323. How many electrons would have to be removed from or added to a penny toleave it charged with 1.0 x 10 -6 C? [Ans: 6.25 x 10 12 ]24. Two point charges, q 1 and q 2 at a separation r in vacuum exert a force F oneach other. What should be their separation in oil of relative permitivity 16so that the force between them remains F only?25. Distilled water is an insulator, but impure water is a conductor. Explainwhy?26. Two equally charged identical metal spheres A and B repel each other witha force of 2·0 x 10 -5 N. Another identical uncharged sphere C is touched to Aand then placed at the mid point between A and B. What is the net force onC?27. Four point charges +5 mC, +2 mC, +10mC and +2 mC are kept at thecorners of a square of side 10 cm. A charge q=+1mC is placed at its centre.Find the net force on q.28. Calculate the distance between two protons such that the electrostatic forcebetween them is equal to the weight of either.29. Two point charges are 0.1 m apart and their combined charge is 9 mC. Ifthey repel each other with a force 18N, then calculate the magnitude of eachcharge.30. Calculate the coulomb force between two alpha particles separated by adistance of 3.2 x 10 -15 mELECTRIC FIELD1. Define electric field. Give its units.2. Name the physical quantity, whose SI unit is N/C.3. Why test is vanishingly small in defining electric field intensity?4. What is electric dipole and dipole moment? Give the unit of electric dipolemoment and its direction.5. Does an electric dipole always experience a torque, when placed in auniform electric field?6. Determine the magnitude of an electric field that will balance the weight ofan electron.7. A distance of 2 m separates two point charges of +5×10 -19 C and +5×10 -19 C.Find the point on the line joining them at which electric field intensity iszero.8. A charged particle is free to move in an electric field. Will it always movealong an electric line of force?9. Electric field intensity within a conductor is always zero. Why?31
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SUBJECT : PHYSICS - SSA Punjab

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