Question 1
- Sketch and label the following:
(a)a bar magnet;
(b) an electromagnet.
2 State two differences each between a bar magnet and an electromagnet
Observation
The expected answers were;
(b)(i) A Bar magnet is a material which attracts ferrous metals.
(ii)Electromagnet needs external supply to function while Bar magnet does not.
(iii)Bar magnet has permanent magnetism while that of electromagnet depends on the current in the coil.
(iv)The polarities of bar magnet are permanent while those of electromagnet can be changed.