Question

Electromagnets are not used in

• A. Electric bell
• B. Refrigerator
• C. Telephone
• D. Galvanometer

Answer 1

The correct option is B

Refrigerator

An explanation for the correct option:

Option B: Refrigerator

1. In an electromagnet, the magnetic field is produced on passing the current.
2. The magnetic field vanishes when the current is switched off. So, the electromagnet is a temporary magnet.
3. But in refrigerators, permanent magnets are used.

An explanation for the incorrect options:

Option A: Electric bell

1. Electric bell works on the principle of electromagnetism.
2. So, option A is incorrect.

Option C: Telephone

1. In telephones, an electromagnet is used in the receiver.
2. So, option C is incorrect.

Option D: Galvanometer

1. Galvanometer contains both the permanent magnet and electromagnet.
2. So, option D is incorrect.

Therefore, option B is correct. Electromagnets are not used in refrigerators.