Questions: Physics Module 6

A charged particle moves parallel to a magnetic field. The magnetic force on it is: A) Maximum B) Zero C) Dependent on speed only D) Dependent on charge only

A proton (q = 1.6 × 10⁻¹⁹ C, m = 1.67 × 10⁻²⁷ kg) moves at 2.0 × 10⁶ m/s perpendicular to a 0.5 T magnetic field. Calculate the radius of its circular path. Section C – Extended Response (10 marks) Answer in full sentences. Diagrams may help.

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

State Faraday’s law of electromagnetic induction and explain how Lenz’s law determines the direction of induced current. physics module 6 questions

An AC generator produces a sinusoidal voltage. Doubling the rotation speed will: A) Double frequency, double peak voltage B) Double frequency only C) Halve frequency, double voltage D) No change

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

Explain why a transformer only works with AC voltage, not DC. A charged particle moves parallel to a magnetic field

Practice Examination Paper

50 minutes Total marks: 40

A horizontal wire of length 0.3 m carries a current of 5.0 A. It is placed in a uniform magnetic field of 0.2 T directed at 30° to the wire. Calculate the magnitude of the magnetic force on the wire. Section C – Extended Response (10 marks) Answer

Describe the energy conversion in: a) A DC motor b) An AC generator

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