`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. (i),(ii)
B. (ii),(iii)
C. (i),(iii)
D. all

Answer

A