A circular coil of radius `5 cm ` has 169 turns carries a current of `2.6 A`. The magnetic induction at a point on the axis at a distance of `12 cm` from the centre of the coil is

Options

A. `1T`
B. `4.2T`
C. `3.14xx10^(-4)`
D. `3.14xx10^(-2)T`

Answer

C

Explanation

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