A striaight wire carries a current of 3 A calculate the magnitude of the magentic field at a point 15 cm away from the wire

Options

A. `2xx10^(-6)T`
B. `4xx10^(-6)T`
C. `3xx10^(-6)T`
D. `8xx10^(-6)T`

Explanation

Here current I =3.4 point where magnetic field is to be determined a =15 cm =015 m
magnitude of magnetic field `B=(mu_(0)21)/(4pi a)`
`=(10^(-)xx2xx3)/(0.15)=4xx10^(-6)T`