Question

A rectangular loop of wire of size 4cm × 10cm carries a steady current of 2A. A straight long wire carrying 5A 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 'τ' = MB sinθ where θ = 0°
Therefore, τ = 0  [∴ As M and B are parallel]
(ii) Force acting on the loop

Direction: Towards the conductor or attractive