A charge of `4xx10^(-9)C` is distributed uniformly over the circumference of a conducting ring of radius 0.3m. Calculate the field intensity at a point on the axis of the ring at 0.4m from its centre, and also at the centre.

Options

A. 40.7 v/m
B. 151.2 v/m
C. 251.2 v/m
D. 115.2 v/m

Answer

D

Explanation

`E=1/(4 pi epsilon_(0)) (Qx)/((x^(2)+R^(2))^(3//2))`