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1., , 5. A square of side has charge at its centre and charge q at one of the corners. The work required to be done, in moving the charge q from the corner to the diagonally opposite corner is, a) Zero, √, b), c), d), , 2., , 2 Two positive point charges of 12, are placed 10 cm apart in air. The work needed to bring them 4, 9. cm closer is, a) 2.4 J, b) 3.6 J, c) 1.6 J, d) 6.0 J, 3 A thin spherical conducting shell of radius R has a charge q. Another charge is placed at the centre of the, 0. shell. The electrostatic potential at a point P at a distance R/2 from the centre of the shell is, , 3., , a), 4., , b), , 7., , 8., , 9., , d) None of these, , c), , (, , ), , b), , (, , ), , c), , (, , ), , d), , (, , ), , 4 In the following diagram the work done in moving a point charge from point P to point A, B and C is, 3. respectively as, then, , a), b), c), d), 6 A spherical drop of mercury having a potential of 2.5V is obtained as a result of merging 125 droplets. The, 0. potential of a constituent droplets would be, a) 1.0V, b) 0.5V, c) 0.2V, d) 0.1V, 8 A hollow metallic sphere of radius R is given a charge . Then, the potential at the centre is, 1., a) Zero, b), c), d), 9 Charges +q and –q are placed at points A and B respectively which are a distance, apart, C is the mid-point, 1. between A and B. The work done in moving a charge+ along the semicircle CRD is, , a), 10., , b), , 4 A positive point charge is carried from a point to a point in the electric field of a point charge + at . If, 1. the permittivity of free space is , the work done in the process is given by (where a =OA and, ), a), , 6., , d), , 4 The work required to put the four charges at the corners of a square of side a, as shown in figure, is, 0., , a), 5., , c), , b), , c), , d), , 9 The work done in bringing a unit positive charge from infinity distance to a point at distance X from a positive, 4. charge is W. Then, the potential at the point is, b) W, a), c), d)
