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.
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
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.
State Faraday’s law of electromagnetic induction and explain how Lenz’s law determines the direction of induced current. A square coil of side 0
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
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 b) The average induced EMF in the coil
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