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Question

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


A

single touch

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B

double touch

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C

using electric current

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D

by induction

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Solution

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.


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