A point charge Q is placed at point O as shown in the figure.
is the potential difference `V_A - V_B` positive, negative or zero if Q is postive or negative?

A point charge q is placed at O as shown in figure. Is V_P - V_Q positive or negative when q

The cartesian coordinates of the point Q in the figure is

Four point charges Q, q, Q and q are placed at the corners of a square of side 'a' as shown in the figure. Find the potential energy of this system?

What is meant by saying that the potential difference between two points is 1 V?

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is placed at its centre C and another charge +2Q outside the shell at a distance r from the centre as shown in figure. Find the force on the charge at the centre of shell and at point A.

A point charge +q is placed at the mid point of a cube of side b. The electric flux emerging from the cube is:

Write two points of differences between solutions of positive and negative deviations .

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is placed at its centre C and another charge +2Q outside the shell at a distance r from the centre as shown in figure. Find the electric flux through the shell.

The network shown in the figure is a part of complete circuit. What is the potential difference V_B - V_A when the current I is 5 A and is decreasing at a rate of 10^3 A s^-1 ?