Physics Module 6 Questions Apr 2026

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

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.

A proton enters a uniform magnetic field directed into the page. If the proton moves upward, the initial magnetic force direction is: A) Up B) Down C) Left D) Right physics module 6 questions

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.

Practice Examination Paper

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

50 minutes Total marks: 40

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. In a DC motor, the split-ring commutator reverses

Explain why a transformer only works with AC voltage, not DC.