Question

 A rectangular loop of wire of size 4 cm x 10 cm carries a steady current of 2 A. A straight long wire carrying 5 A current is kept near the loop as shown. If the loop and the wire are coplanar, find: 

(i) the torque acting on the loop and

(ii) the magnitude and direction of the force on the loop due to the current carrying wire.

Answer 1

 (i) Torque on the loop

τ  = MB sinθ

As M and B are parallel, θ = 0

Therefore, τ  =  0

(ii) Force acting on the loop

Direction : Towards conductor / Attractive