In a parallel plate capacitor, the distance between the plates is d and potential difference across the plates is V. Energy stored per unit volume between the plates of capacitor is ?

The capacity of a parallel plate condenser is 10μF when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm then the capacity of this parallel plate condenser will be ?

Energy stored in a capacitor is ?

A charge QμC is placed at the centre of a cube, the flux coming out from any surface will be ?

The electric intensity due to a dipole of length 10 cm and having a charge of 500μC, at a point on the axis at a distance 20 cm from one of the charges in air, is ?

If a dipole of dipole moment p is placed in a uniform electric field E, then torque acting on it is given by ?

If a dipole of dipole moment \( \vec{p} \) is placed in a uniform electric field \( \vec{E} \), then the torque acting on it is given by ?

<p>(a) \( \vec{\tau} = \vec{p} \cdot \vec{E} \)</p>

<p>(b) \( \vec{\tau} = \vec{p} \times \vec{E} \)</p>

<p>(c) \( \vec{\tau} = \vec{p} + \vec{E} \)</p>

<p>(d) \( \vec{\tau} = \vec{p} - \vec{E} \)</p>

Answer :  <p>(b) \( \vec{\tau} = \vec{p} \times \vec{E} \)</p>