Answer to Question #217095 in Electricity and Magnetism for Maddy

Question

1. Apply the concepts of magnetism, electromagnetism, the motor effect and electromagnetic induction to discussing real-world devices and observed phenomena.
2. Discuss safety issues related to the static magnetic fields and changing magnetic fields used in magnetic resonance imaging (MRI).

Answer 1

a) When a coil is placed between the magnet, and due to the rotation of the coil, the flux between the magnet gets cut and change , due to this change in flux, the emf will get induced in the coil.

$e = \frac{-d\phi}{dt}$

b)

As we know, in the MRI scanner, we pull on magnetic materials and may cause unwanted movement of the medical device. The radio frequency energy and magnetic fields that change with time may cause heating of the implanted medical device and the surrounding tissue, which could lead to burns.