Magnetic Fields Quiz - CBSE Class 12 Physics

Free practice quiz: Magnetic Fields (CBSE Class 12 Physics). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Physics practice quiz has 18 multiple-choice questions on Magnetic Fields, and 18 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the unit of magnetic field strength?

   1. Tesla
   2. Newton
   3. Joule
   4. Coulomb
   Show answer

   Answer: A. Tesla

   The strength of a magnetic field is measured in Teslas (T).

2. What shape do magnetic field lines take around a bar magnet?

   1. Straight lines
   2. Converging lines
   3. Closed loops
   4. Random pattern
   Show answer

   Answer: C. Closed loops

   Magnetic field lines around a bar magnet form closed loops that exit from the north pole and enter the south pole.

3. What effect does a magnetic field have on an uncharged particle?

   1. Attracts it
   2. Repels it
   3. No effect
   4. Increases its mass
   Show answer

   Answer: C. No effect

   A magnetic field only affects charged particles, so it has no effect on uncharged particles.

4. Which principle explains the operation of an electric motor?

   1. Faraday's Law
   2. Maxwell's Law
   3. Lenz's Law
   4. Lorentz's Force Law
   Show answer

   Answer: D. Lorentz's Force Law

   The operation of an electric motor is based on Lorentz's Force Law, which states that a current-carrying conductor in a magnetic field experiences a force.

5. What is the formula for the magnetic field inside a long solenoid?

   1. B = μ₀(nI)
   2. B = μ₀(qv)
   3. B = μ₀(ϕ)
   4. B = μ₀(v/d)
   Show answer

   Answer: A. B = μ₀(nI)

   The magnetic field inside a long solenoid is given by the formula B = μ₀(nI), where μ₀ is the permeability of free space, n is the number of turns per unit length, and I is the current.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which device is used to measure magnetic field strength?
2. What is the direction of the magnetic field around a straight current-carrying conductor?
3. What happens to the magnetic field when the current in a coil is increased?
4. Which of the following materials is typically ferromagnetic?
5. What is the force experienced by a charged particle moving in a magnetic field called?
6. How does the Earth's magnetic field protect the planet?
7. What happens to the magnetic field lines inside a solenoid?
8. If the current direction in a wire is reversed, how does the magnetic field change?
9. What is the phenomenon called when an induced current flows in a coil due to changing magnetic flux?
10. What happens to the magnetic field strength of a solenoid if the number of turns is doubled?
11. What can cause magnetic hysteresis in ferromagnetic materials?
12. In the context of magnetic fields, what does the term 'flux' refer to?
13. What is the effect of temperature on the magnetic properties of materials?

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