Quiz: QZ-20260503-43769

Quiz Details

QZ-20260503-43769

Topics:

Physics Faradays and lenz law Induction Amperes law, magnetic force, DC motors, flux Integrals and conceptial questions

Difficulty: Level 3 - Medium

Questions: 5

Generated: May 03, 2026 at 09:15 AM

Generated by: Guest User

Instructions: Select an answer for each question and click "Check Answer" to see if you're correct. Then view the explanation to learn more!

1 What does Faraday's Law of Electromagnetic Induction state?

A) Electric current produces a magnetic field that remains unchanged.

B) The induced electromotive force is directly proportional to the rate of change of magnetic flux.

C) The force on a charged particle is independent of its velocity.

D) The magnetic field is constant in time.

Correct Answer: B
Explanation: Faraday's Law states that the induced electromotive force in a circuit is proportional to the rate of change of magnetic flux through the circuit.

2 Which of the following laws is used to calculate the magnetic field around a current-carrying conductor?

A) Ohm's Law

B) Lenz's Law

C) Ampère's Law

D) Faraday's Law

Correct Answer: C
Explanation: Ampère's Law relates the integrated magnetic field around a closed loop to the electric current passing through the loop.

3 In a DC motor, what is the role of the commutator?

A) To reduce friction in the motor.

B) To reverse the direction of current flow every half turn.

C) To increase the magnetic field strength.

D) To convert AC to DC.

Correct Answer: B
Explanation: The commutator in a DC motor reverses the direction of current flow in the winding, ensuring that the torque remains in the same direction as the rotor turns.

4 What is magnetic flux?

A) The total magnetic field over a given area.

B) The rate of change of electric field.

C) The product of electric field and resistance.

D) The force exerted by the magnetic field on a moving charge.

Correct Answer: A
Explanation: Magnetic flux is defined as the total magnetic field passing through a specified area, and it is measured in Weber (Wb).

5 Which of the following integrals is used to calculate work done by a variable force?

A) ∫ m dv

B) ∫ v dt

C) ∫ a dt

D) ∫ F dx

Correct Answer: D
Explanation: The work done by a variable force is calculated by the integral of the force over the distance, represented as ∫ F dx.

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