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?

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

Explanation:

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.