For the magnetic field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must be

Options

A. `0^(@)`
B. `90^(@)`
C. `180^(@)`
D. `45^(@)`

Answer

B

Explanation

The magnetic field due to small element of conductor of length is given by `dB=mu_(0)/(4pi)(i dlsintheta)/(r^(2))`
This value will be maximum when
`sintheta=1=sin90^(@)` or `theta=90^(@)`