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

Which of the following items would get attracted towards a magnet?

  1. Common pins

  2. Silver spoon

  3. Glass bangle

  4. Comb

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

Common pins are typically made of steel, which is an alloy containing iron. Iron and its alloys (like steel) are ferromagnetic materials that are strongly attracted to magnets. Silver is not magnetic, glass is non-magnetic, and combs are typically made of plastic (also non-magnetic).

Multiple choice

An electric bell is an example of

  1. bar magnet

  2. cylindrical magnet

  3. electromagnet

  4. horseshoe magnet

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

Electromagnet is right as when the bell switch is put ON current flows through the magnet and makes it active electromagnet.

Multiple choice

A magnetic compass is placed at the mid point of a bar magnet. The correct observation will be that

  1. it will point in the North-South direction

  2. it will align along the length of the bar magnets with its N-pole towards the N-pole of the bar magnet

  3. it will align along the length of the bar magnet with its N-pole towards the S-pole of the magnet

  4. it will point randomly in any direction

  5. it will align along the length of the bar magnets with its S-pole towards the S-pole of the bar magnet
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, magnetic compass is always aligned along the length of the bar magnet with its N-pole towards the S-pole of the magnet.

Multiple choice

Magnets do not lose their properties significantly when

  1. left in open

  2. the magnet is hammered several times

  3. dropped from a height

  4. an alternating current is passed around the magnet

  5. the magnet is heated to a very high temperature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There is no effect on the magnet, when left in open.

Multiple choice

Which of the following items is needed to make an electromagnet?

  1. An iron nail, a battery and a copper wire

  2. An iron nail, a battery and a light bulb

  3. An iron nail, a light bulb and copper wire

  4. A battery, a light bulb and a copper wire

  5. An iron nail, a battery and a thread
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, through a battery and copper wire an iron nail can be changed into an electromagnet.