(a) Calculate the potential at a point P due to a charge of `4 xx 10^(-7)C` located 9 cm away.
(b) Hence obtain the work done in bringing a charge of `2 xx 10^(-9)C` from infinity to the point P. Does the answer depend on the path along which the charge is brought?

A charge 8 mC is located at the origin. Calculate the work done in taking a small charge -2 xx 10^(-9) C from point P(0, 0, 3 cm) to a point Q(0, 4 cm, 0), via point R(0, 6 cm, 9 cm).

Electric potential at a point in an electric field measured as the work done in bringing unit positive charge from infinity to that point:- Is electric potential a scalar or a vector quantity?

Electric potential at a point in an electric field is measured as the work done in bringing unit positive charge from infinity to that point:- The inetnsity of electric field at a point due to a point electric charge is 20NC^-1 and the electric potential at that point is 10 JC^-1 . Calculate the distance of the point from the charge.

Two point charges of 2 xx 10^(-7)C are 1.0 cm apart. What is the magnitude of the field produced by either charge at the side of the other?

Two point charge q_A=3muC and q_b=-3muC are located 20 cm apart in vacuum. If a negative test charge of magnitude 1.5xx10^(-9)C is placed at the point, what is the force experienced by the test charge ?

A polythene piece rubbed with wool found to have a negative charge of 3xx10^(-7)C .Estimate the number of electrons transferred (from which to which?)

Two point charges of +5 xx 10^(-19)C and +20 xx 10^(-19)C are separated by a distance of 2m. Find the point on the line joining them at which electric field is zero. (Find the position of null point)