Physics Module 6 - Questions

A wire carries current northward in a magnetic field pointing east. The force on the wire is: A) Up B) Down C) North D) Zero

A square coil of side 0.2 m and 50 turns is placed perpendicular to a magnetic field. The field changes uniformly from 0.1 T to 0.5 T in 0.4 s. Calculate: a) The change in magnetic flux through one turn. b) The average induced EMF in the coil.

Describe the energy conversion in: a) A DC motor b) An AC generator physics module 6 questions

The right-hand palm rule is used to find: A) Direction of induced current B) Direction of force on a current-carrying conductor in a field C) Direction of magnetic field around a wire D) Polarity of induced EMF Section B – Short Answer (20 marks) Answer in the spaces provided.

A step-up transformer has 200 turns on the primary and 800 turns on the secondary. If the primary voltage is 120 V AC, the secondary voltage is: A) 30 V B) 120 V C) 480 V D) 960 V A wire carries current northward in a magnetic

Lenz’s law is a consequence of which conservation principle? A) Conservation of charge B) Conservation of energy C) Conservation of momentum D) Conservation of mass

State Faraday’s law of electromagnetic induction and explain how Lenz’s law determines the direction of induced current. Calculate: a) The change in magnetic flux through one turn

In a DC motor, the split-ring commutator reverses current every half cycle to: A) Increase speed B) Prevent overheating C) Keep torque in the same direction D) Convert AC to DC

50 minutes Total marks: 40

Faraday’s law of electromagnetic induction states that the induced EMF is proportional to: A) The magnetic field strength B) The rate of change of magnetic flux C) The current in the coil D) The resistance of the circuit