Question

A permanent magnet was used as field magnet in an electric generator. (a) Name two problems you are likely to face. (b) How can you overcome these difficulties?

Answer 1

Two difficulties likely to be faced are;

(1) Very exceedingly high currents and temperatures causes demagnetization

(2) High cost of rare-Earth metals

(b) Steps to overcoming the challenges of using a permanent field magnet in an electric generator include

(1) Use of permanent magnetic materials such as Neodymium, Nd which produces high energy for a given rotation and Dy, Dysprosium which also has good power production but is also able to work at high temperature

(2) Development of nor rear-Earth metals for use in applications that demand less

Step-by-step explanation: