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1. Two copper spheres of of same radii, one hollow and the other solid ,are charged to, the same potential. Which will hold more charge ?, , a) Solid sphere b) Hollow sphere, , c) Both will hold more charge d) Nothing can be predicated, , 2. Which of the following statement is true?, {a) Electrostatic force is a conservative force., (b) Potential at a point is the work done per unit charge in bringing a charge from any point to infinity., (c) Electrostatic force is non-conservative, (d) Potential is the product of charge and work., , 3, Consider a uniform electric field in the z-direction. The potential is a constant, (a) for any x for a givenz, (b) for any y for a given z, (c) on the x-y plane for a given z, (d) all of these, , 4, A capacitor is charged by using a battery which is then disconnected. A dielectric slab is, then slipped between the plates, which results in, , a) reduction of charge on the plates and increase of potential across the plates, , b) increase in the potential difference across the plates, reduction in stored energy, but no, change in the charge on the plates, , Cc) decrease in the potential in stored energy, but no change in the charge on the plates, , d) none of the above, , 5. In a charged capacitor the energy is stored in:, a) the electric field between the plates, , b) the edge of the capacitor plates, , c) positive charges, , d) both in positive and negative charges., , 6. What fraction of the energy drawn from the charging battery is stored in the capacitor?, a) 75% b) 100% c) 25% d) 50%, , 7. Keeping the charge on a capacitor unchanged we, can decrease the energy of the, capacitor by, 1) Increasing the dielectric constant of the medium between the plates, 2) Decreasing the dielectric constant of the medium between the plates, 3) Making the dielectric constant zero, 4) None of the these
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8. Equipotentials at a great distance from a callection of charges whose total sum is nat zero, are approximately [NCERT Exemplar], (a) spheres, (b) planes, (c) paraboloids, (d) ellipsoids, , 9. If a unit positive charge is taken from one point to another over an equipotential surface,, then, , (a) work is done on the charge., , (b) work is done by the charge., , (c}) work done is constant., , (d) no work is done., , 10. A conductor with a positive charge, (a) is always at +ve potential., , (b) is always at zero potential., , (c) is always at negative potential., , (d) may be at +ve, zero or -ve potential., , 11. 1 volt is equivalent to, , , , , , oe, joule joule, 0 oe ( Sond, , 12. The work done in bringing a unit positive charge from infinite distance to a point at distance, x from a positive charge Q is W. Then the potential at that point is, , (a) *2 (ow, @% (@ WQ, , 13. Equipotential surfaces, , (a) are closer in regions of large electric fields compared to regions of lower electric fields., (b) will be more crowded near sharp edges of a conductor., , (c) will always be equally spaced., , (d) both (a) and (b) are correct., , 14, Which of the following statements is false for a perfect conductor?, (a) The surface of the conductor is an equipoten-tial surface.
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(b) The electric field just outside the surface of a conductor is perpendicular to the surface., (c) The charge carried by a conductor is always uniformly distributed over the surface of the, conductor., , (d) None of these., , 15. Ina parallel plate capacitor, the capacity increases if, (a) area of the plate is decreased., , (b) distance between the plates increases., , (c) area of the plate is increased., , (d) dielectric constantly decreases.
