Question

A conducting square loop having edges of length 2.0cm is rotated through 180° about a diagonal in 0.20s. A magnetic field B exists in the region which is perpendicular to the loop in its initial position. If the average induced emf during the rotation is 20mV, find the magnitude of the magnetic field.

Answer 1

E = 20mV = 20 x 10–3V

A = (2 x 10–2)2 = 4 x 10–4

Dt = 0.2s, θ = 180°