A uniformly charged ring of radius `R` is rotated about its axis with constant linear speed `v` of each of its particle. The ratio of electric field to magnetic field at a point `P` on the axis of the ring distant `x=R` from centre of ring is `( c` is speed of light )

Options

A. `c^2/v`
B. `v^2/c`
C. `v/c`
D. `c/v`

Answer

A

Explanation

`E=1/(4piepsilon_0)(qx)/((R^2+x^2)^(3/2))`
`B=(mu_0iR^2)/(2(R^2+x^2)^(3/2))`
where, `i=qf=q(V/(2piR))`
`c=1/(sqrt((epsilon_0mu_0)`