Physics

Magnetism and Electromagnetism

1,019 Questions

This hub provides practice questions on magnetism and electromagnetism. It covers magnetic flux density, electromagnets, magnetic lines of force, and electromagnetic induction. These physics concepts frequently appear in technical and non-technical competitive exams.

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Magnetism and Electromagnetism Questions

Multiple choice

When a bar magnet immersed in a heap of iron filings is taken out, it is observed that the iron filings stick to the surface of the bar magnet. The iron filings would be observed to

  1. stick uniformly throughout the surface of the bar magnet

  2. stick randomly on the surface of the bar magnet

  3. have the maximum concentration at the two ends of the bar magnet

  4. have the maximum concentration slightly away from the two ends of the bar magnet

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a bar magnet immersed in a heap of iron filings is taken out, it is observed that iron filings stick to the surface of the bar magnet. The iron filings would be observed to have the maximum concentration at the two ends of the bar magnet.

Multiple choice

Why is it advised not to heat a magnet?

  1. Heating leads to demagnetisation.

  2. Heating increases the strength of the magnet.

  3. Heating breaks the magnet.

  4. Heating melts the magnet.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is advised not to heat a magnet because heating leads to loss of magnetism or demagnetisation of the magnet.

Multiple choice

Which of the following is a remarkable property of a magnet?

  1. Directive property

  2. Conductive property

  3. Inductive property

  4. Demagnetisation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The directional property of a magnet is remarkable. A magnetic compass, which is used to find direction, utilises the directional property of magnets.

Multiple choice

Which of the following is the sure test of magnetism?

  1. Attraction between the opposite poles.

  2. Repulsion between the same poles.

  3. When suspended freely, a magnet always aligns in N-S direction.

  4. Two poles of a magnet are indivisible.

  5. There is no sure test of magnetism.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When we bring the same poles of two magnets near to each other, then they will repel each other and it is the surest test of magnetism.

Multiple choice

Which of the following is not the property of a magnet?

  1. A magnet attracts magnetic material.

  2. When a magnet is suspended freely, it points in N-S direction.

  3. Same poles of a magnet attract and opposite poles repel.

  4. Magnetic influence can pass through the screen of cloth, plastic and paper.

  5. The force of magnetic attraction is the maximum at poles.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Same poles of a magnet repel, whereas the opposite poles attract.

Multiple choice

What will happen, if we break a magnet from the middle?

  1. A magnet will lose its magnetic power.

  2. Both the pieces will become new magnet with N-S pole.

  3. North and south poles will be separated.

  4. Nothing will happen.

  5. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Both the pieces will become new magnet.