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Electromagnetism Quiz (Medium)

1. What is the magnetic field inside a solenoid?

a) Uniform b) Non-uniform c) Zero

2. What happens to the strength of the magnetic field inside a solenoid when the number of turns in the coil is increased?

a) Increases b) Decreases c) Remains the same

3. What is the purpose of a commutator in a DC motor?

a) To reverse the direction of current flow b) To increase the speed of the motor c) To regulate the voltage

4. Which type of materials are attracted to a magnet?

a) Diamagnetic b) Paramagnetic c) Ferromagnetic

5. What happens to the direction of the magnetic field lines around a current-carrying conductor if the direction of the current is reversed?

a) The direction of the magnetic field lines remains the same b) The magnetic field lines disappear c) The direction of the magnetic field lines reverses

6. Which law relates the strength of the magnetic field to the current-carrying conductor's length and the distance from the conductor?

a) Gauss's law b) Faraday's law c) Ampere's law

7. What causes an induced current in a conductor?

a) Change in the conductor's resistance b) Change in the conductor's length c) Change in the magnetic field

8. What is electromagnetic induction?

a) Production of an electric current due to a magnetic field b) Production of a magnetic field due to an electric current c) Interaction between two permanent magnets

9. What is the phenomenon where a changing magnetic field induces an electric current in a closed loop of wire?

a) Inductance b) Electromagnetic force c) Electromagnetic induction

10. Which scientist is credited with discovering the phenomenon of electromagnetic induction?

a) Michael Faraday b) James Clerk Maxwell c) Albert Einstein