1 2 3 4 Two charges of equal magnitude q are placed in air at a distance 2a apart and third charge 2q is placed at midpoint of the line connecting identical charges The potential energy of the system is 1 3 8ma 5q 8 a 1 2 3 2 3q 2 8 a 4 The electrical potential on the surface of a uniformly charged sphere of radius r due to a charge 3 x 10 C on it is 500V The intensity of electric field on the surface of the sphere is in N C 1 10 2 200 3 between 10 and 20 7q 8 a 1 3Q 1 42R 2 1 4 0 Charge Q is uniformly distributed throughout the volume of a solid hemisphere of radius R Then the potential at center O of the hemisphere is 3 Rate of change of potential with position on them is zero 4 They can be spheres 6 Two charged conducting spheres of radil R and R potential at their surfaces is A non conducting ring of radius 0 5 m carries a torpeelquesve equal surface charge density The ratio of charge of 1 11 10 10 C distributed non uniformly on its circumference producing an electric field everywhere in space The value of line integral J Ede 0 at the center of the ring in volt 1 0 is given potential at infinity is zero Q R 1 4 TUD 5 3Q 4R 7 3 8 1 Q 47 4R Which of the following is not true about equipotential surfaces 1 They do not cross each other 2 They are concentric spheres for uniform electric field 3 1 1 Q 4E8R 20170 The work done by battery to charge an uncharged parallel plate condenser of plate separation d and plate area of cross section A such that the uniform electric field between the plates is E is Ad 30 20 1 3 2U Ad 3 E Ad 4 E Ad A capacitor is charged by a battery and the energy stored is U The battery is now removed and the separation between the plates is doubled The energy stored now is 2 U 4 4U