Question

A very small circular loop of area 5 x 10^-4m² , resistance 2 ohm and negligible inductance, is initially coplanar and cocentric, with a much larger fixed circular loop of radius 0.1m. A constant current of 1 ampere is passed through the bigger loop and the smaller loop is rotated with an angular velocity 'ω' rad/s, about a diameter. Calculate the induced emf and induced current, as a function of time, in the smaller loop.

Answer 1

The magnetic field, at the centre of larger loop, is

Magnetic flux, linked with the smaller loop (of area A₂), placed at centre will be (nearly)

The induced emf, in the smaller