Question

The potential variation with distance for a uniformly charged ring having radius $R$ and carrying charge $Q$ is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

For a ring

$V_P=\frac{kQ}{\sqrt{R^2+x^2}},V_{centre}=\frac{kQ}{R},Asx\to \infty ,V\to 0.$

So potential is maximum at the centre and then decreases as

$V_P\propto \frac{1}{\sqrt{R^2+x^2}}$


So option $\left(c\right)$ is correct.