Magnetic field induction at the center of a circular coil of radius `5cm` and carrying a current `0.9A` is `(` in `S.I.` units in`)(in_(0)=` absolute permitivity of air in `S.I.` units `:` velocity of light `=3xx10^(8)ms^(-1))`

Options

A. `(1)/(in_(0)10^(16))`
B. `(10^(16))/(in_(0))`
C. `(in_(0))/(10^(16))`
D. `10^(16)in_(0)`

Answer

A

Explanation

`B=(mu_(0)ni)/(2r),c=(1)/(sqrt(mu_(0)E_(0)))`