Master Magnetic Fields: Interactive Quizzes for Year 12 Physics

Question 1

Define magnetic flux density.

Accepted Answer

Magnetic field strength per unit area

Answer

Force per unit charge

Answer

Work done per unit charge

Answer

Potential energy per unit charge

Question 2

When a current-carrying wire is placed in a magnetic field, what is the direction of the force experienced by the wire?

Accepted Answer

Perpendicular to the wire and magnetic field

Answer

Parallel to the wire

Answer

Antiparallel to the magnetic field

Answer

Zero

Question 3

What is the primary purpose of a solenoid?

Accepted Answer

To produce a uniform magnetic field inside the coil

Answer

To produce a stronger magnetic field at the ends of the coil

Answer

To produce a weaker magnetic field inside the coil

Answer

To not produce a magnetic field

Question 4

Inside a toroid, the magnetic field:

Accepted Answer

Is uniform

Answer

Is non-uniform

Answer

Is zero

Answer

Is proportional to the current flowing through the toroid

Question 5

Which unit is not used to measure magnetic flux?

Accepted Answer

Ampere

Answer

Weber

Answer

Tesla

Answer

Gauss

Question 6

A circular loop of wire carries an electric current, producing a magnetic field. Where is this magnetic field present?

Accepted Answer

Both inside and outside the loop

Answer

Inside the loop only

Answer

Outside the loop only

Answer

Neither inside nor outside the loop

Question 7

Describe the relationship between the magnetic field strength (B) and the current (I) flowing through a long, straight wire.

Accepted Answer

Directly proportional: B ∝ I

Answer

Inversely proportional: B ∝ 1/I

Answer

Proportional to the square root: B ∝ √I

Answer

Independent of each other: B is constant

Question 8

Define a solenoid.

Accepted Answer

A coil of wire wound in a helical shape

Answer

A coil of wire wound in a circular shape

Answer

A coil of wire wound in a rectangular shape

Answer

A coil of wire wound in a random shape

Question 9

Identify the SI unit of magnetic field strength.

Accepted Answer

Tesla

Answer

Weber

Answer

Ampere

Answer

Volt

Question 10

Which device utilizes the principle of magnetic levitation?

Accepted Answer

Maglev train

Answer

MRI scanner

Answer

Electric motor

Answer

Loudspeaker

Question 11

Describe the shape of the magnetic field lines surrounding a current-carrying wire.

Accepted Answer

Circular

Answer

Straight

Answer

Spiral

Answer

Elliptical

Question 12

A rectangular loop carrying current is placed in a uniform magnetic field. Which action will **not** increase the magnetic force on the loop?

Accepted Answer

Changing the orientation of the loop so that its normal is parallel to the magnetic field

Answer

Increasing the current in the loop

Answer

Increasing the strength of the magnetic field

Answer

Increasing the area of the loop

Question 13

Which of the following statements best describes the force experienced by a charged particle moving perpendicularly to a magnetic field?

Accepted Answer

Perpendicular to both the magnetic field and the particle's velocity

Answer

Parallel to the magnetic field

Answer

Antiparallel to the magnetic field

Answer

In the same direction as the particle's velocity

Question 14

Identify the device that utilizes the principle of electromagnetic induction to convert mechanical energy into electrical energy.

Accepted Answer

Generator

Answer

Electric motor

Answer

Transformer

Answer

Capacitor

Question 15

The SI unit of magnetic field strength is:

Accepted Answer

Tesla

Answer

Weber

Answer

Gauss

Answer

Ampere

Question 16

The force experienced by a charge moving perpendicular to a magnetic field is:

Accepted Answer

Lorentz force

Answer

Gravitational force

Answer

Coulomb force

Answer

Nuclear force

Question 17

Which of the following materials is a strong diamagnetic material?

Accepted Answer

Bismuth

Answer

Iron

Answer

Copper

Answer

Lead

Question 18

The magnetic flux through a surface is defined as:

Accepted Answer

∮ B · dA

Answer

∮ B dot dℓ

Answer

∇ · B

Answer

∮ E · dA

Question 19

The principle of operation of an electric motor involves:

Accepted Answer

Magnetic field interacting with a current-carrying conductor

Answer

Lorentz force on a moving charge

Answer

Electromagnetic induction

Answer

Capacitive reactance

Question 20

Increasing the current in a solenoid results in:

Accepted Answer

Linear increase in magnetic field strength

Answer

Exponential decrease in magnetic field strength

Answer

Constant magnetic field strength

Answer

Reversal of magnetic field direction

Question 21

Which of the following is an application of magnetic fields in the medical field?

Accepted Answer

Magnetic resonance imaging (MRI)

Answer

Radiation therapy

Answer

Chemotherapy

Answer

Ultrasound

Question 22

In which direction does the magnetic field generated by a current-carrying solenoid primarily align?

Accepted Answer

Parallel to the axis of the solenoid

Answer

Perpendicular to the axis of the solenoid

Answer

At an angle to the axis of the solenoid

Answer

The direction depends on the direction of the current

Question 23

Which of the following materials exhibits non-magnetic properties?

Accepted Answer

Aluminum

Answer

Iron

Answer

Cobalt

Answer

Nickel

Question 24

What is the primary function of a magnetic shield?

Accepted Answer

Blocking magnetic fields

Answer

Enhancing magnetic fields

Answer

Redirecting magnetic fields

Answer

Storing magnetic energy

Question 25

How do magnetic fields differ from electric fields in terms of their source?

Accepted Answer

Magnetic fields arise from moving charges, while electric fields arise from stationary charges

Answer

Electric fields arise from moving charges, while magnetic fields arise from stationary charges

Answer

Magnetic fields are stronger than electric fields

Answer

Electric fields are stronger than magnetic fields

Question 26

What is the purpose of utilizing the right-hand rule in determining the direction of the magnetic force on a current-carrying wire?

Accepted Answer

Determining the direction of the force

Answer

Determining the direction of the magnetic field

Answer

Determining the direction of the current

Answer

Determining all three directions (magnetic field, current, and force)

Question 27

Which of the following statements is NOT a characteristic of magnetic fields?

Accepted Answer

Magnetic fields are parallel to the direction of current flow.

Answer

Magnetic fields can exert forces on moving charges.

Answer

Magnetic fields can be created by electric currents.

Answer

Magnetic fields can be shielded by ferromagnetic materials.

Question 28

According to the right-hand rule, what is the direction of the magnetic force on a positive charge moving perpendicular to a magnetic field?

Accepted Answer

Perpendicular to both the magnetic field and the velocity.

Answer

Parallel to the magnetic field.

Answer

Antiparallel to the magnetic field.

Answer

Zero.

Question 29

Which of the following materials is not classified as magnetic?

Accepted Answer

Copper

Answer

Iron

Answer

Steel

Answer

Nickel

Question 30

What is the shape of the magnetic field lines surrounding a straight current-carrying wire?

Accepted Answer

Concentric circles

Answer

Straight lines parallel to the wire

Answer

Expanding spirals

Answer

Hyperbolas

Question 31

In a solenoid, how does the magnetic field strength relate to the current flowing through the solenoid?

Accepted Answer

Directly proportional

Answer

Inversely proportional

Answer

Proportional to the square of the current

Answer

Independent of the current

Question 32

What is the primary purpose of a magnetic core in an inductor?

Accepted Answer

To increase the inductance

Answer

To decrease the inductance

Answer

To shield the inductor from external magnetic fields

Answer

To minimize energy losses

Question 33

What is the shape of the magnetic field lines surrounding a bar magnet?

Accepted Answer

Horseshoe-shaped lines emerging from the north pole and converging at the south pole

Answer

Straight lines from the north pole to the south pole

Answer

Concentric circles around the magnet

Answer

Irregular and random lines

Question 34

A wire carrying a current is placed in a uniform magnetic field. What is the direction of the force on the wire?

Accepted Answer

Perpendicular to both the current direction and the magnetic field direction.

Answer

Parallel to the magnetic field direction.

Answer

Parallel to the current direction.

Question 35

A compass needle points north. What is the reason for this?

Accepted Answer

The Earth acts as a giant magnet with its magnetic south pole near the geographic north pole.

Answer

It is attracted by the Sun's magnetic field.

Answer

It aligns with the direction of the prevailing winds.

Question 36

Two bar magnets have north and south poles. What happens when the two north poles are brought close to each other?

Accepted Answer

They repel each other.

Answer

They rotate to become parallel to each other.

Answer

They attract each other.

Answer

They remain unaffected.

Question 37

Which of the following statements about magnetic field lines is accurate?

Accepted Answer

Magnetic field lines are continuous and form closed loops.

Answer

Magnetic field lines can intersect.

Answer

Magnetic field lines start at the north pole and end at the south pole.

Question 38

An electric motor utilizes the interaction between a magnetic field and a current to produce rotational motion. What is the primary function of the commutator in this device?

Accepted Answer

To reverse the direction of current flow in the coil every half turn, ensuring continuous rotation.

Answer

To increase the strength of the magnetic field.

Answer

To reduce the resistance in the circuit.

Question 39

A loop of wire carrying a current is placed in a uniform magnetic field. What is the direction of the torque on the loop?

Accepted Answer

Perpendicular to both the magnetic field and the plane of the loop.

Answer

Parallel to the plane of the loop.

Answer

Parallel to the magnetic field.

Question 40

A charged particle moving in a magnetic field experiences a force. What is the direction of this force?

Accepted Answer

Perpendicular to both the velocity of the particle and the magnetic field.

Answer

Parallel to the velocity of the particle.

Answer

Parallel to the magnetic field.

Question 41

A wire carrying a current is placed perpendicular to a uniform magnetic field. What is the direction of the force on the wire?

Accepted Answer

Perpendicular to both the current and the magnetic field.

Answer

Parallel to the current.

Answer

Parallel to the magnetic field.

Question 42

A compass needle points north because:

Accepted Answer

The Earth acts as a giant bar magnet with its south magnetic pole near the geographic North Pole.

Answer

The compass needle is attracted to the North Star.

Answer

The Earth's magnetic field is strongest at the North Pole.

Question 43

A solenoid is a coil of wire wound in the shape of a:

Accepted Answer

Helical spring.

Answer

Circle.

Answer

Square.

Answer

Straight line.

Question 44

What is the direction of the magnetic field lines around a straight wire carrying a current?

Accepted Answer

Concentric circles around the wire, with the direction determined by the right-hand grip rule.

Answer

Radial lines emanating from the wire.

Answer

Straight lines parallel to the wire.

Question 45

A magnetic field is a region in space where:

Accepted Answer

A magnetic force acts on moving charges.

Answer

Gravitational forces dominate.

Answer

Electric charges are stationary.

Answer

Only iron objects experience a force.

Question 46

Two parallel wires carrying currents in the same direction will:

Accepted Answer

Attract each other.

Answer

Repel each other.

Answer

Experience a torque.

Answer

Not exert any force on each other.

Question 47

A charged particle moving in a magnetic field will experience a force that is:

Accepted Answer

Perpendicular to both its velocity and the magnetic field.

Answer

Parallel to the magnetic field.

Answer

Parallel to its velocity.

Question 48

A device that converts electrical energy into mechanical energy using the interaction between magnetic fields and currents is called a:

Accepted Answer

Motor.

Answer

Generator.

Answer

Transformer.

Answer

Capacitor.

Question 49

Which of the following materials is NOT attracted by a magnet?

Accepted Answer

Copper.

Answer

Iron.

Answer

Nickel.

Answer

Cobalt.