Question

The sure test of magnetism is:
A. attraction
B. repulsion
C. induction
D. attraction and repulsion both

Answer 1

Hint: Magnetism is the phenomenon of a substance producing magnetic field lines, for example a bar magnet. Use the concept that like poles of two magnets repel each other whereas the unlike poles attract each other. Magnets even attract metals like iron.

Complete answer:
Let us first understand what magnetism is. Magnetism is the phenomenon of a substance producing magnetic field lines. The magnetic fields of a substance exert forces on a current carrying conductor, a moving charge and a magnet.

A magnetic field is produced by a current carrying conductor and by a magnetic. Every substance that produces magnetic field lines has a north pole and a south pole.

If we take two magnetic substances, they may attract or repel each other depending on the poles of the magnets that interact. The like poles of two magnetic substances repel each and their unlike poles attract each other. This means that the north poles or the south poles of both the magnets repel each other. Whereas the north pole of one magnet attracts the south pole of the other magnet.

Other than magnetic substances, a magnet also attracts metals like iron. Therefore, with the attraction of two materials we cannot determine whether both of them act as magnets or show magnetism.
Whereas, repulsion only occurs between the like poles of two magnetic substances. Therefore, repulsion is the sure test for magnetism.

So, the correct answer is “Option B”.

Note:
Induction is one of the methods used to introduce some charge on an object. Therefore, induction is related to electrostatics and is not related to magnetism. Hence, it is one of the incorrect options.