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.

Electromagnet coresMagnetic flux densityMagnetic lines of forceElectromagnetic inductionBar magnet propertiesMagnetic materials

Magnetism and Electromagnetism Questions

Multiple choice

A freely suspended bar magnet always points in __________ direction.

  1. north- east

  2. south-west

  3. north-south

  4. south-east

  5. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer. A freely suspended magnet always comes to rest in the north-south direction. Earth is a giant magnet and its magnetic south pole is towards the geographic north pole. As opposite poles of two magnets attract each other, therefore the north pole of the bar magnet  points in the direction of the geographic north pole (magnetic south pole of the earth) and south pole of the bar magnet towards the geographic south pole of the earth (magnetic north pole of the earth).

Multiple choice

Magnets lose their property when ______________.

  1. hammered

  2. heated

  3. dropped from some height

  4. all of the above

  5. none of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is the correct answer. Magnets lose their property when hammered, heated or dropped from some height, so they should be handled properly.

Multiple choice

____________ is a natural magnet.

  1. Bar magnet

  2. Magnetite

  3. Horse- shoe magnet

  4. Ball- ended magnet

  5. Cylindrical magnet
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is the correct answer. Magnetite, also called lodestone, is a natural 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 magnets.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is advised not to heat a magnet as heating demagnetises the magnet.

Multiple choice

Magnets should be stored safely because they

  1. become weak if handled carelessly

  2. are expensive

  3. break easily

  4. attract all substances
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnets should be stored safely because they become weak and lose their magnetism if handled carelessly. 

Multiple choice

Which of following statements is true about the characteristics of magnetic lines of force?

(a) Two lines of force never intersect each other. (b) Two lines of force always intersect each other. (c) Two lines of force sometimes intersect each other. (d) Two lines of force are always perpendicular to each other.

  1. Two lines of force never intersect each other.

  2. Two lines of force always intersect each other.

  3. Two lines of force sometimes intersect each other.

  4. Two lines of force are always perpendicular to each other.

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Two lines of force never intersect each other. This is correct.