`L` is a circular ring made of a uniform wire, currents enters and leaves the ring through straight conductors which, if produces, would have passed through the centre `C` of ring. The magnetic field at `C`

(i) due to the straight conductors is zero
(ii) due to the loop is zero
(iii) due to the loop is proportional to `theta`
(iv) due to loop is proportional to `(pi-theta)`

Options

A. due to the straight conductors is zero
B. due to the loop is zero
C. due to path II is proportional to `theta`.
D. due to the path I is proportional `(pi-theta)`

Answer

B