What is the main principle behind electromagnetic induction?

The movement of electrons in a conductor

The interaction between electric and magnetic fields

The heating effect of an electric current

The force experienced by a current-carrying conductor in a magnetic field

Which of the following factors does NOT affect the emf induced in a coil of wire?

The strength of the magnetic field

The speed at which the magnetic field changes

The number of turns in the coil

In an AC generator, what is the purpose of the slip rings?

To maintain a constant connection between the rotating coil and the external circuit

To increase the frequency of the output current

To reduce energy losses due to friction

When investigating the field around a wire, how is the direction of the magnetic field determined?

By the direction of the current flow

By the magnetic force experienced by a nearby magnet

What is the result of placing a current-carrying conductor in a magnetic field?

The conductor experiences a force perpendicular to both the current and the magnetic field

The conductor generates an electric field

The conductor's resistance increases

The conductor's temperature decreases

In an electric motor, what role does the commutator play?

It increases the voltage of the motor

It reverses the direction of current in the coil every half turn

It reduces the resistance of the motor

Why are transformers used in the transmission of electrical power?

To step up or step down voltage levels

To increase the power of the transmission

To reduce the frequency of the transmission

What is the principle behind the operation of a transformer?

Faraday's Law of Electromagnetic Induction

Electromagnetic Effects Free MCQ Practice Test with Solutions

	Physics for GCSE/IGCSE 127 videos\|148 docs\|35 tests

	Physics for GCSE/IGCSE 127 videos\|148 docs\|35 tests

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