Question

A coil of radius `pi` meters, 100 turns carries a current of `3A`. The magnetic induction at a point on its axis at a distance equal to `sqrt(3)` times its radius from its centre is
A. `7.2xx10^(-6)wbm^(-2)`
B. `7.4xx10^(-6)wbm^(-2)`
C. `7.5xx10^(-6)wbm^(-2)`
D. `7.8xx10^(-6)wbm^(-2)`

Answer 1

Correct Answer - 3
`B=(mu_(0)nir^(2))/(2(r^(2)+x^(2))^(3//2))`