Question

18. Which does not affect the strength of an electromagnet?

A the current in the solenoid
B the temperature of the coil
OC the number of loops in the coil
D the type of ferromagnetic core​

Answer 1

The temperature does not affect the strength of a magnet

Step-by-step explanation:

An electromagnet is obtained by winding an insulated wire round a soft iron rod with the wire ends connected to a DC source. such magnets have temporary magnetic properties which disappears with time as the current supply is cut off.

Furthermore the strength off an electromagnet

1. increases as current increases
2. increases as the number of turns increases
3. the type of magnetic core is highly essential as an iron core will do batter than a silver core