Question

Advantages of an electromagnet over a permanent magnet is:

• A. Strength of an electromagnet is fixed and polarity of an electromagnet can be reversed
• B. Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed
• C. Strength of an electromagnet can be varied and polarity of an electromagnet is fixed
• D. Strength of an electromagnet is fixed and also polarity of an electromagnet is fixed

Answer 1

The correct option is B

Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed

Strength of an electromagnet can be varied and polarity of an electromagnet can be reversed