Answer :


Given-
No. of turns in the coil, n = 100



Area of the coil, A = 5 × 4 cm2 = 20 × 10−4 m2



Magnitude of current = 2 A



Torque acting on the coil, τ = 0.2 N m−1


We know that torque acting on a rectangular coil having n turns is given by



Where


B= applied magnetic field


A= area of rectangular loop


I = current flowing through coil


n = number of turns










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