CUET Preparation Today
A dipole of dipole moment p is kept at the centre of a ring of radius R and charge Q. The dipole moment has direction along the axis of the ring. The resultant force on the ring due to the dipole is |
Zero $\frac{kpQ}{R^3}$ $\frac{2kpQ}{R^3}$ $\frac{kpQ}{R^3}$ only if the charge is uniformly distributed on the ring |
$\frac{kpQ}{R^3}$ |
$ F = p \frac{dE}{dx} $ $ E = \frac{kQ}{2{R^2+x^2}^{3/2}}$ $\frac{dE}{dx} _{ x= 0 }= \frac{kQ}{R^3}$ $\Rightarrow F = p \frac{dE}{dx} = \frac{kpQ}{R^3}$ |
