A ring with a uniform charge `Q` and radius `R`, is placed in the `yz` plane with its centre at the origin

Options

A. The field at the origin is zero
B. The potential at the orgin is `sqrt((kQ)/R)`
C. The field at the point (x,0,0) is `(kQ)/(x^(2))`
D. The field at the point (x,0,0) is `(kQ)/(R^(2)+x^(2))`

Answer

A

Explanation

Field at the origin the centre of the ring is zero. Potential at the the orign `=KQ//R`.