30. The potential at the centre of the square is-

Electric charges of +10 muC,+5 muC,-3 muC and +8 muC are placed at the corners of a square of side sqrt(2) m, the potential at the centre of the square is

Four charges 10^(-8), -2 xx 10^(8), +3xx10^(-8) and 2xx10^(-8) coulomb are placed at the four corners of a square of side 1m the potential at the centre of the square is

Electric charges of + 10 mu C, + 5mu C, - 3mu C and +9 mu C are placed at the corners of a square of side sqrt(2) m the potential at the centre of the square is

Four charges 10^(-5) , -2times10^(-5) , +3times10^(-5) and 2times10^(-5) coulomb are placed at the four corners of a square of side 1m the potential at the centre of the square is...

Four point charges -Q, -q, 2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is

A hollow metal sphere of radius 10cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is

A hollow metal sphere of radius 5 cms is charged such that the potential on its surface is 10 volts. The potential at the centre of the sphere is