Question

An electromagnet makes use of

• A. magnetic effect of current
• B. heating effect of current
• C. force exerted by a magnet
• D. strength of a magnet

Answer 1

The correct option is A

magnetic effect of current

The explanation for the correct option-

1. An electromagnet works on the principle of the magnetic effect of electric current.
2. An electromagnet is a temporary magnet.
3. An electromagnet behaves like a bar magnet.
4. When an electric current is allowed to pass through it, one end behaves like a north pole and the other end like a south pole.
5. Polarity of the ends depends on the direction of the current.

The explanation for the incorrect option-

1. Heating effect of current explains that when the current is passed through a conductor it gets heated up.
2. Force exerted by a magnet is called magnetic force.
3. No magnet is placed inside the electromagnet, an electromagnet is a magnet itself.

Hence, option A is correct.