Question

Which of the following methods is used to magnetize a magnetic substance without touching it by a magnet?

• A. single touch
• B. double touch
• C. using electric current
• D. by induction

Answer 1

The correct option is D

by induction

Explanation for correct option:

Option (D)

1. A magnetic substance can be magnetized by the effect of a magnetizing force of a magnet temporarily is called magnetisation by induction.
2. A magnetizing force is a force applied by a magnet on any other magnetic body.
3. In the process of induction, a magnetic substance is not in direct touch with a magnet.

Explanation for incorrect option:

Option (A)

1. Single touch is a method in which a magnetic substance is magnetized by rubbing a bar magnet over it.

Option (B)

1. Double touch is a method of magnetisation in which a magnetic substance is magnetised by rubbing a pair of bar magnets in a particular way over it.

Option (C)

1. When an electric current is passed through a magnetic substance it behaves as a magnet.

Thus, option (D) is the correct option.