List of top Physics Questions on Electric Dipole asked in CBSE CLASS XII

An electric dipole consists of two point charges \(+1\,\mu\text{C}\) and \(-1\,\mu\text{C}\), held 10 cm apart. It is subjected to a uniform electric field of \(100\,\text{N/C}\). Calculate the amount of work done in turning the dipole from its position of stable equilibrium to the position of unstable equilibrium, in the field.

An electric dipole consists of two point charges \(+q\) and \(-q\) separated by a distance \(2a\). Derive an expression for the electric field \(\vec E\) due to this dipole at a point distant \(r\) from the centre of the dipole on the equatorial plane. Write the expression for the electric field at a far off point, i.e. \(r \gg a\).

An electric dipole consists of two point charges \(+q\) and \(-q\) separated by a distance \(2a\). Derive an expression for the electric field \(\vec E\) due to this dipole at a point distant \(r\) from the centre of the dipole on the equatorial plane. Write the expression for the electric field at a far off point, i.e. \(r \gg a\).

An electric dipole of dipole moment \( \vec{p} = (0.8\,\hat{i} + 0.6\,\hat{j}) \times 10^{-29}\,\text{Cm} \) is placed in an electric field \( \vec{E} = 1.0 \times 10^7\,\hat{k}\,\text{V/m} \). Calculate the magnitude of the torque acting on it and the angle it makes with the x-axis, at this instant.

An electric dipole of dipole moment \( \vec{p} \) consists of point charges \( +q \) and \( -q \), separated by distance \( 2a \). Derive an expression for the electric potential in terms of its dipole moment at a point at a distance \( x \, (x \gg a) \) from its centre and lying:
(I) along its axis, and
(II) along its bisector (equatorial) line.