A merry-go-round has an area of 300 m² and spins at 2 rpm about a vertical axis at a place where the Earth's magnetic field is vertical and has a magnitude of 5 * 10^-5 T.The emf around the rim is: A)0 V B)0.5 mV C)3.1 mV D)15 mV E)190 mV

Question

Quizplus · Accepted Answer

The emf induced in a loop due to a changing magnetic field is given by Faraday's law of electromagnetic induction. However, in this case, the magnetic field is constant and vertical, and the merry-go-round spins about a vertical axis, so there is no change in the magnetic flux through the area of the merry-go-round. Therefore, the emf around the rim is 0 V.

A Merry-Go-Round Has an Area of 300 M2 and Spins

A Merry-Go-Round Has an Area of 300 M² and Spins