An infinite line charge produces a field of `(9 * 10^4) NC^-1` at a distance of 2cm. Calculate the linear charge density.

Consider an infinitely long straight uniformly charged wire with linear charge density lambda To find the electric field at P (located at a distance r from the line of charge), describe an appropriate Gaussian surface.

An electron is moving at 10^(6) ms^(-1) in a direction parallel to a current of 5 A, flowing through an infinitely long straight wire, separated by a perpendicular distance of 10cm in air. Calculate the force expected on the electron

A dipole consisting of an electron and a proton separated by a distance 4xx10^(-10)m is situated in an electric field of intensity 3xx10^5NC^(-1) at an angle of 30^@ with the field. Calculate the dipole moment and torque acting on it.

An electric dipole, when held at 30^(0) with respect to a uniform electric field of 10^(4)NC^(-1) experiences a torque of 9x10^(26)Nm. Calculate dipole moment of the dipole.

Potential energy of a system of charges is directly proportional to the product of charges and inversely to the distance between them.Two point charges 3 x 10^(-8) C and - 2 x 10^(-8) C are separated by a distance of 15cm. At what point on the line joining the charges the potential is zero?

A point charge of + 10 mu c is at a distance of 5 cm directly above the centre of a square of side 10 cm as shown in figure. What is the electric flux through the square?

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.