Calculate the potential at a point P due to a charge of `4times10^(-7)` C located 9 cm away.

A negative charge of 30 esu is at a distance of 30 cm from a positive charge of 20 esu. What is the potential at a point 10 cm from the first charge on the line joining the two charges? Where will the potential be zero?

A point charge of 8 mC is located at the origin. Calculate the work done in taking a small charge of -2xx10^(-19)C from a point A (0, 0, 3 cm) to the point B(0, 4cm, 0) via a point C (0, 6 cm, 9 cm).

A point-charge A of 5xx10^(-9)C is placed in air. Calculate the work done while a point-charge B of 3xx10^(-9)C completes one revolution in a circle around the charge A. The radius of the circle is 6xx10^(2)m .

Determine the potential at a distance r from a point charge +q. How can the potential at a point be determined due to a number of point charges?

An infinite number of charges, each of value q, are placed on the x-axis at the points x = 1 , x = 2, x = 4 , x = 8, ………. . Find the potential and intensity due to these charges at x = 0. If the charges are alternately positive and negative what will be the potential and intensity at the same point?

A point-charge A of 5xx10^(-9)C is placed in air. Calculate the work done while The charge B is brought towards charge A from 6 cm to 5 cm.

A spherical conductor of radius 12cm has a charge of 1.6times10^(-7)C distributed uniformly on its surface. What is the electric field : at a point18 cm from the centre of the sphere