23454.Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then in equilibrium condition, the ratio of the magnitude of the electric fields at the surface of spheres A and B is
1 : 4
4 : 1
1 : 2
2 : 1
23455.A, B and C are three points in a uniform electric field. The electric potential is
Maximum at A
Maximum at B
Maximum at C
Same at all the three points A, B and C
23456.A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 μF and 9 μF capacitors), at a point distant 30 m from it, would equal :
360 N/C
420 N/C
480 N/C
240 N/C
23457.Consider a neutral conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then,
negative and distributed uniformly over the surface of the sphere
negative and appears only at the point on the sphere closest to the point charge
negative and distributed non–uniformly over the entire surface of the sphere
zero
23458.A capacitor of 2 μF is charged as shown in the diagram. When the switch S is turned to position 2, the percentage of its stored energy dissipated is
75%
80%
0%
20%