Physics Module 6 Questions Page

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

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 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

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

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.

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 The force on the wire is: A) Up

Explain how an eddy current brake works, referring to Lenz’s law and energy conservation. Include one practical application.