Electromagnetic Induction: Interactive Learning Quizzes for Year 13 Physics

Question 1

According to Faraday's law, the magnitude of the voltage induced in a coil is directly proportional to which of the following?

Accepted Answer

Rate of change of magnetic flux through the coil

Answer

Number of turns in the coil

Answer

Cross-sectional area of the coil

Answer

Strength of the magnetic field

Question 2

In a transformer, the ratio of the number of turns in the primary coil to the number of turns in the secondary coil is equal to the ratio of:

Accepted Answer

Primary voltage to secondary voltage

Answer

Primary current to secondary current

Answer

Primary power to secondary power

Answer

Primary resistance to secondary resistance

Question 3

Which type of transformer is used to increase the voltage of an alternating current (AC) supply?

Accepted Answer

Step-up transformer

Answer

Step-down transformer

Answer

Isolation transformer

Answer

Autotransformer

Question 4

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

Accepted Answer

The presence of an aluminum core in the coil

Answer

The speed at which magnetic flux changes through the coil

Answer

The surface area of the coil

Answer

The number of loops in the coil

Question 5

Which of the following defines electromagnetic induction correctly?

Accepted Answer

A changing magnetic field generates an electric field.

Answer

A changing electric field generates a magnetic field.

Answer

A moving charge generates an electric field.

Answer

A moving charge generates a magnetic field.

Question 6

Which factor does NOT influence the magnitude of the induced EMF?

Accepted Answer

Conductor length

Answer

Rate of magnetic flux variation

Answer

Conductor loop area

Answer

Conductor loop orientation relative to the magnetic field

Question 7

What is the primary purpose of a transformer?

Accepted Answer

Increase or decrease voltage

Answer

Increase or decrease current

Answer

Convert AC to DC

Answer

Convert DC to AC

Question 8

What is the SI unit for magnetic flux?

Accepted Answer

Weber (Wb)

Answer

Tesla (T)

Answer

Ampere (A)

Answer

Volt (V)

Question 9

Which type of transformer has an adjustable turns ratio?

Accepted Answer

Autotransformer

Answer

Step-up transformer

Answer

Step-down transformer

Answer

Isolation transformer

Question 10

To minimize core losses in a transformer, which technique is most effective?

Accepted Answer

Choosing a core material with reduced hysteresis loss

Answer

Enlarging the core material's cross-sectional area

Answer

Increasing the core material's resistance

Answer

Utilizing a core material with enhanced permeability

Question 11

Which of the following is the correct SI unit for magnetic flux density?

Accepted Answer

Tesla (T)

Answer

Weber (Wb)

Answer

Ampere (A)

Answer

Volt (V)

Question 12

According to Faraday's law, the magnitude of the induced electromotive force (EMF) in a conductor is directly proportional to the:

Accepted Answer

Rate of change of magnetic flux through the conductor

Answer

Current flowing through the conductor

Answer

Resistance of the conductor

Answer

Area of the conductor

Question 13

Lenz's law provides a method to determine the:

Accepted Answer

Direction of the induced current

Answer

Magnitude of the induced EMF

Answer

Polarity of the induced magnetic field

Answer

Frequency of the induced EMF

Question 14

A moving magnet induces an EMF in a stationary conductor. This phenomenon is known as:

Accepted Answer

Mutual induction

Answer

Self-induction

Answer

Electrostatic induction

Answer

Magnetic induction

Question 15

The core of an electromagnet is usually made of a material with:

Accepted Answer

High permeability

Answer

Low permeability

Answer

High resistivity

Answer

Low resistivity

Question 16

Which of the following is NOT a characteristic of electromagnetic waves?

Accepted Answer

Require a medium to propagate

Answer

Can travel through a vacuum

Answer

Are transverse waves

Answer

Have a constant speed in a vacuum

Question 17

Which of the following statements about Lenz's law is correct?

Accepted Answer

Induced current opposes the cause of its production

Answer

Induced current enhances the cause of its production

Answer

Induced current is independent of the cause of its production

Answer

Induced current always flows in the same direction

Question 18

Faraday's law of electromagnetic induction states that:

Accepted Answer

A change in magnetic flux through a coil induces an electromotive force (EMF) in the coil.

Answer

An electric current creates a magnetic field around a conductor.

Answer

A moving magnet creates an electric current in a coil.

Question 19

According to Lenz's law, the direction of the induced EMF in a coil is:

Accepted Answer

Such that it opposes the change in magnetic flux.

Answer

Perpendicular to the direction of the magnetic field.

Answer

Aligned with the direction of the magnetic field.

Question 20

In a transformer, the primary purpose of the iron core is to:

Accepted Answer

Increase the magnetic flux through the coils.

Answer

Act as an electrical insulator.

Answer

Reduce the energy losses in the transformer.

Answer

Generate an electric current in the coils.

Question 21

One of the applications of electromagnetic induction is:

Accepted Answer

Electric generators.

Answer

Batteries.

Answer

Solar cells.

Answer

Capacitors.

Question 22

Which material is NOT suitable for use as a core in a transformer due to its low magnetic permeability?

Accepted Answer

Aluminum.

Answer

Cobalt.

Answer

Nickel.

Answer

Iron.

Question 23

The purpose of laminating the core of a transformer is to:

Accepted Answer

Reduce eddy currents and energy losses.

Answer

Enhance the electrical conductivity of the core.

Answer

Increase the weight of the transformer.

Answer

Improve the magnetic insulation of the core.