Practice Examination Paper
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.
Explain why a transformer only works with AC voltage, not DC.
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 physics module 6 questions
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.
Describe the energy conversion in: a) A DC motor b) An AC generator
50 minutes Total marks: 40
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
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
State Faraday’s law of electromagnetic induction and explain how Lenz’s law determines the direction of induced current. Practice Examination Paper A square coil of side 0
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
Explain how an eddy current brake works, referring to Lenz’s law and energy conservation. Include one practical application.