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

A

Explanation

The magnetic field due to small element of conductor of length l is given by `dB = (mu_(0))/(pi) (Idl sin theta)/(r^(2))`
This value will be maximum when `sin theta =1 sin 90^(@) implies theta = 90^(@)`