Magnetic field intensity at the centre of coil of `50` turns, radius `0.5m` and carrying a current of `2A` is

Options

A. `0.5 xx 10^(-5) T`
B. `1.25 xx 10^(-4) T`
C. `3 xx 10^(-5) T`
D. `4 xx 10^(-5) T`

Answer

B

Explanation

`B = (mu_(0) IN)/(2r) = (4pi xx 10^(-7) xx 2 xx 50)/(2 xx 0.5) = 1.25 xx 10^(-4) T`.