A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is :
A point charge q is placed at the origin O as shown in figure. Work done in taking another charge -Q from point A(0, a) to another point B(a, 0) along the straight path AB is :
Three charges each + q are placed at the corners of an isosceles triangle ABC of sides BC and AC, 2a. D and E are the mid points of BC and AC respectively. The work done in taking a charge Q from D to E is:
If an electron is brought towards another electron, the electric potential energy of the system :
Charges q and -g are placed at points A and B respectively which are at distance 2 L apart. C is the mid point between A and B. The work done in moving a charge + Q along the semicircle CRD is:
