Permanent magnets are formed because of heating effect of electricity.
(a) Why does electric current show heating effect? (b) Name two appliances that work because of the heating effect of electric current? [3 MARKS]
In certain applications, electromagnets are better than permanent magnets because: (more than one answers can be correct)
Which effect of electric current is more prominent?? Heating effect or magnetic effect??
Alnico is used for making permanent magnets because it has