A current loop `ABCD` is held fixed on the plane of the paper as shown in figure. The arcs `BC( radius = b) and DA ( radius = a)` of the loop are joined by two straight wires `AB and CD` at the origin `O` is 30^(@)`. Another straight thin wire with steady current `I_(1)` flowing out of the plane of the paper is kept at the origin .
Due to the process of the current `I_(1)` at the origin:
A. The force on AB and DC are zero
B. The force on AD and BC are zero
C. The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(4pi) [2 (b -a) + (pi)/(3) (a +b)]`
D. The magnitude of the net force on the loop is given by `(mu_(0)II_(1))/(24ab) ( b -a)`
