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

How does poles of a magnet exist?

  1. Individually

  2. In pairs

  3. In group

  4. Does not exist
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnetic poles always exist in pairs - you cannot have an isolated north or south pole. Every magnet has both a north pole and a south pole, and they always occur together. If you break a magnet, each fragment becomes a complete magnet with its own north-south pole pair. Poles don't exist individually, in groups separately, or fail to exist.

Multiple choice

Where are poles of bar magnet located?

  1. At ends

  2. At centre

  3. In between end and centre

  4. Both centre and poles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a bar magnet, the magnetic poles are located at the two ends. This is where the magnetic field is strongest and where the north and south poles are situated. The centre of the bar magnet is called the neutral region where magnetic field is weak. Poles are not at the centre, not between end and centre, and not distributed at both locations.

Multiple choice

A bar magnet is placed on a sheet containing iron nails. To which part of the magnet, iron nails will be attracted the most?

  1. Centre

  2. Poles

  3. Both centre and pole

  4. Neither poles nor centre
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron nails are attracted most to the poles because the magnetic field is strongest at these two ends. The centre has the weakest magnetic field strength. This is why magnetic materials cluster around the poles when placed near a bar magnet.

Multiple choice

Identify which two are the poles of magnet.

  1. West and south pole

  2. North and South pole

  3. North and east pole

  4. West and east pole
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Every magnet has two poles - north and south. These are the only two poles that exist in magnetism. East and west are cardinal directions, not magnetic poles.

Multiple choice

There are 50 magnet bars kept on the floor. How should the magnets be placed, so that just by pulling the first one, all others also move?

  1. They should be placed with their non polar edges touching.

  2. They should be placed in a circular form.

  3. They should be placed in a line with opposite poles touching.

  4. They should be placed in a line with like poles touching.

  5. They should be placed one above another with like poles on the same side.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is the correct answer. 

Multiple choice

Ram is trying to make a magnet from an iron bar. What should be his course of action?

  1. Rubbing the iron bar onto the magnet in one direction

  2. Hitting the magnet on the iron bar

  3. Rubbing the magnet onto the iron bar in one direction

  4. Hitting the iron bar on the magnet

  5. Tying the iron bar and the magnet together
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. Rubbing the magnet onto the iron bar repeatedly will help the iron bar attain magnetic property.