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EL ATEE ie Caen EU OOE, , @ Pr (or ()r 2, 3. The existence of a negative charge on a body implies that it has : =, (a) lost some of its electrons (b) lost some of its neutrons, <(o)vacquired some electrons from outside —_()_acquired some protons from outside., , 4, Two point charges separated by a distance d repel each other with a force of 9N. If the, separation between them becomes 34, the force of repulsion will be :, , ort O)3N WSN —, , 5. The dielectric constant K of a metal is:, (>) finite and greater than 1
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9. Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of, , repulsion between the ions, the number of electrons missing from each ion will be (e is {h,, charge on an electron and & is the absolute permittivity., , , , , , atl ; r z ", ea © f Fe gy [tno Fd @ oF, e a : Vey ¢, 10. How many electrons must be removed from an electrically neutral plate to give it a positive charp,, of 1 x 107C ?, 625 x 10! () 645 x 103 (c) 6-25 x 10-1 @ 645 x 10-8,, , i., , In a hydrogen atom, the distance between the electron and proton is 2-5 x 10-!! m. The electrical, force of attraction between them will be, , @ 28x 10-7N ()62x107N ().3°7 x 10-7N (@ 91 x 10-7N., , 12. Two charged spheres separated by a distance d exert some force F on each other. If they are, , immersed in a liquid of dielectric constant 2, icn the force exerted by them, when all other, conditions remain same is :, , @ 4 (b) 28 (OF _@ FR., , 13. A charge gis placed at the centre of the line joining two exactly equal positive charges each having, , charge Q. The system of three charges will be in equilibrium if g is equal to, , _ A -Q4 ()+Q ()-Q @ Q/2., 14. Dimensions of electric field intensity when mass is (M), time is (T) (a) length is (L) and charge is, (Q) can be given as, @ MUT2Q4 LOMLT2Q! — (@ MALT2Q4 @ M229., 15. If a glass rod is rubbed with silk, the glass rod acquires a positive charge because :, (a) protons are added to it (®) protons are removed from it, (c) electrons are added to it _Ady electrons are removed from it., , 16. Acomb when run through dry hair attracts small bits of paper. This is due to :, , (a) comb is a good conductor, (b) paper is a good conductor, , the paper get polarised by the charged comb, (@) the comb possesses magnetic properties., , 1. ‘Two charges of equal magnitudes kept at a distance r from each other exert a force F on each other., , , , If the charges are halved and distance between them is doubled, then the new force acting on each, charge is :, , F, @ = w* (ar ax:, , , , (c) 24000 N (d 3000N., , 19., , 21.
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>, = —_> => > =>, (@@) t= P.E \_ Dy =PxE (jt = P+E @t=p, , 29. Two equal and opposite charges of 2 x 10-!°C are i orming a di, placed at a distance of 1 em f. dipole, are placed in an electric field of 2 x 105 N C-!, The maximum torque on dipole is : , (a) 2/2 x 10°Nm (6)8 x 108Nm (04x 10°Nm Ad} 4x 10-7 Nm, , 30. Which one out of the following is not a property of electric field lines :, (@) Field lines are continuous curves without any breaks., (b) Two field lines cannot cross each other., (c) Field lines start at a positive charge and end at a negative charge., i Fred _— a cope aa to a non-uniform electric field. The rae wi, , 31. An electric dipole is placed at an angle of 30°, em neaaat, o
