Electrostatics

Assertion Mass of a body decreases slightly
when it is negatively charged.
Reason Charging is due to transfer of electrons.

Positive charge \(Q\) is distributed uniformly over a circular ring of radius \(R\). A point particle having a mass \((m)\) and a negative charge \(-q\) is placed on its axis at a distance \(x\) from the centre. Assuming \(x < R\), find the...

A half ring of radius \(R\) has a charge of \(\lambda\) per unit length. The electric force on \(1 \mathrm{C}\) charged placed at the centre is

Assertion : The electric field due to a dipole on its axis line at a distance \(r\) is \(E\). Then, electric field due to the same dipole on the equatorial line and at the same distance will be \(E / 2\).
Reason : Electric field due to dipo...

Charges \(+q\) and \(-q\) are placed at points \(A\) and \(B\) respectively which are a distance \(2 L\) apart, \(C\) is the mid-point between \(A\) and \(B\). The work done in moving a charge \(+Q\) along the semicircle \(C R D\) is