Electromagnetic Induction and Inductance: Interactive Learning Quizzes

Question 1

According to Faraday's law, an EMF is induced when there is a change in which physical quantity?

Accepted Answer

Magnetic field

Answer

Electric field

Answer

Charge

Answer

Voltage

Question 2

A transformer operates based on the principle of:

Accepted Answer

Electromagnetic induction

Answer

Electric current

Answer

Voltage

Answer

Resistance

Question 3

In a generator, the motion responsible for inducing EMF is:

Accepted Answer

Rotational

Answer

Rectilinear

Answer

Oscillatory

Answer

Circular

Question 4

Which of the following is a real-world application of Faraday's law?

Accepted Answer

Electric motors

Answer

Batteries

Answer

Capacitors

Answer

Resistors

Question 5

The direction of induced EMF is given by:

Accepted Answer

Lenz's law

Answer

Ohm's law

Answer

Kirchhoff's laws

Answer

Coulomb's law

Question 6

A coil with a high inductance has:

Accepted Answer

Greater energy storage capacity

Answer

Lower energy storage capacity

Answer

Higher resistance

Answer

Lower resistance

Question 7

Which of the following materials is most commonly used in the construction of electromagnets?

Accepted Answer

Iron

Answer

Copper

Answer

Aluminium

Answer

Plastic

Question 8

The SI unit of magnetic flux density is:

Accepted Answer

Tesla

Answer

Weber

Answer

Ampere

Answer

Volt

Question 9

According to Faraday's law of electromagnetic induction, the electromotive force (EMF) induced in a conductor is directly proportional to what quantity?

Accepted Answer

Rate of change of magnetic flux through the conductor

Answer

Current through the conductor

Answer

Magnetic field strength

Answer

Area of the conductor

Question 10

Inductance of a coil is directly proportional to the square of which parameter?

Accepted Answer

Number of turns

Answer

Length of the coil

Answer

Cross-sectional area of the coil

Answer

Current through the coil

Question 11

What is the effect of inserting an iron core into an inductor?

Accepted Answer

Increases inductance

Answer

Decreases inductance

Answer

No effect on inductance

Answer

Reverses inductance

Question 12

Which law forms the foundation for the operation of generators?

Accepted Answer

Faraday's law of electromagnetic induction

Answer

Lenz's law

Answer

Ohm's law

Answer

Ampere's law

Question 13

Which of the following is the SI unit of inductance?

Accepted Answer

Henry (H)

Answer

Ampere (A)

Answer

Volt (V)

Answer

Farad (F)

Question 14

What is the primary function of a transformer?

Accepted Answer

To increase or decrease voltage

Answer

To convert AC to DC

Answer

To store electrical energy

Answer

To amplify signals

Question 15

How does inductance affect current flow in a circuit?

Accepted Answer

Inductance opposes changes in current flow

Answer

Inductance promotes changes in current flow

Answer

Inductance has no effect on current flow

Answer

Inductance is directly proportional to current flow

Question 16

What is the energy stored in an inductor with inductance 'L' and current 'I' flowing through it?

Accepted Answer

1 / 2 * L * I^2

Answer

L * I

Answer

Zero

Answer

I / 2 * L

Question 17

A transformer has 'N1' primary turns and 'N2' secondary turns. If the primary coil is connected to an AC voltage source, what is the ratio of the secondary voltage (V2) to the primary voltage (V1)?

Accepted Answer

N2 / N1

Answer

1 / (N2 / N1)

Answer

N1 * N2

Answer

N1 / N2

Question 18

Which factors affect the inductance of a coil?

Accepted Answer

Number of turns, cross-sectional area, length, core material

Answer

Length and core material only

Answer

Number of turns only

Question 19

What is the SI unit of inductance?

Accepted Answer

Henry (H)

Answer

Farad (F)

Answer

Weber (Wb)

Answer

Tesla (T)

Question 20

In a coil connected to a battery, when the current reaches a constant value, what is the rate of change of magnetic flux through the coil?

Accepted Answer

Zero

Answer

Increasing

Answer

Constant

Answer

Decreasing

Question 21

Which material is commonly employed as a core for inductors to enhance their inductance?

Accepted Answer

Iron

Answer

Aluminum

Answer

Plastic

Answer

Copper

Question 22

How does a generator convert mechanical energy into electrical energy?

Accepted Answer

By rotating a coil in a magnetic field

Answer

By using a capacitor

Answer

By using a battery

Answer

By using a transformer

Question 23

What is a fundamental difference between AC and DC current?

Accepted Answer

AC current changes direction periodically

Answer

DC current has a higher voltage

Answer

DC current is used for long-distance transmission

Answer

AC current is less efficient