A ring of radius a contains a charge q distributed. uniformly ober its length. Find the electric field at a point. on the axis of the ring at a distance x from the centre.

Options

A. `(1)/(4 pi epsilon_(0)) .(4Q)/(sqrt(R^(2) + x^(2)))`
B. `(1)/(4 pi epsilon_(0)) .(2Q)/(sqrt(R^(2) + x^(2)))`
C. `(1)/(4 pi epsilon_(0)) .(3Q)/(sqrt(R^(2) + x^(2)))`
D. `(1)/(4 pi epsilon_(0)) .(Q)/(sqrt(R^(2) + x^(2)))`

Answer

4