Question

What is the reason behind the use of electromagnets instead of permanent magnets in power generators.

• A. The strength of permanent magnet increases with time.
• B. The permanent magnets become shiny with time.
• C. The shape of permanent magnets is huge.
• D. The strength of permanent magnet decreases with time.

Answer 1

The correct option is D

The strength of permanent magnet decreases with time.

The main reason to use electromagnets in power generators instead of permanent magnets is its strength. The strength of permanent magnet decreases with time. But, electromagnets does not have any issues like reduction in strength as it works on the principle of magnetic field production through the current carring conductor. Till the current is present in the conductor it has a magnetic field around it.