A current of 6 A passes through the wire shown in the figure. Find the magnitude of magnetic field at point C. The radius is 0.2 m.
`(mu_(0)=4pixx10^(-7)TmA^(-1))`

Options

A. `1.41xx10^(-4)`
B. `1.41xx10^(-5)`
C. zero
D. `1.41xx10^(-3)`

Answer

B

Explanation

I = 6 A, a = 0.2 m, `theta=90^(@)=pi/2`
`mu_(0)=4pixx10^(-7)TmA^(-1)`
`B=(mu_(0)I(2pi-theta))/(4pia)`
= `(4pixx10^(-7)xx6((3pi)/2))/(4pixx0.2)=1.41xx10^(-5)T`