Magnetism

Question 1

What is magnetism?

Answer 1

Magnetism is a physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.

Question 2

True or False: All materials can be magnetized.

Answer 2

False

Question 3

What are the two poles of a magnet called?

Answer 3

North pole and South pole

Question 4

Fill in the blank: Like poles of magnets ______ each other.

Answer 4

repel

Question 5

Fill in the blank: Unlike poles of magnets ______ each other.

Answer 5

attract

Question 6

What is the unit of magnetic field strength?

Answer 6

Tesla (T)

Question 7

What is a magnetic field?

Answer 7

A magnetic field is the region around a magnet where magnetic forces can be detected.

Question 8

What material is commonly used in making permanent magnets?

Answer 8

Iron, cobalt, or nickel

Question 9

True or False: The Earth has a magnetic field.

Answer 9

True

Question 10

What is the direction of magnetic field lines around a magnet?

Answer 10

From the North pole to the South pole

Question 11

What is an electromagnet?

Answer 11

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

Question 12

Multiple Choice: Which of the following is NOT a property of magnets? A) Attracts iron B) Has a North and South pole C) Conducts electricity D) Can repel another magnet

Answer 12

C) Conducts electricity

Question 13

What happens to the magnetic field of an electromagnet when the current is turned off?

Answer 13

The magnetic field disappears.

Question 14

Fill in the blank: The area around a magnet where magnetic forces can be felt is called the ______.

Answer 14

magnetic field

Question 15

What is magnetic flux?

Answer 15

Magnetic flux is the product of the magnetic field strength and the area perpendicular to the field.

Question 16

True or False: Magnetic fields can penetrate through most materials.

Answer 16

True

Question 17

What is the right-hand rule used for in magnetism?

Answer 17

To determine the direction of the magnetic field around a current-carrying conductor.

Question 18

What is the term for materials that can be easily magnetized?

Answer 18

Ferromagnetic materials

Question 19

Multiple Choice: Which of the following is an example of a non-magnetic material? A) Iron B) Copper C) Cobalt D) Nickel

Answer 19

B) Copper

Question 20

Fill in the blank: The force experienced by a charged particle moving in a magnetic field is called the ______ force.

Answer 20

Lorentz

Question 21

What is the function of a compass?

Answer 21

To indicate the direction of the Earth’s magnetic field.

Question 22

True or False: A magnet can lose its magnetism if heated above a certain temperature.

Answer 22

True

Question 23

What is the phenomenon where a magnetic field induces an electric current called?

Answer 23

Electromagnetic induction

Question 24

What device uses electromagnetic induction to generate electricity?

Answer 24

Generator

Question 25

What is the formula for calculating magnetic force on a charged particle?

Answer 25

F = qvBsin(θ)

Question 26

Fill in the blank: The strength of the magnetic field is directly proportional to the ______.

Answer 26

current

Question 27

What is the purpose of a magnetic shield?

Answer 27

To protect sensitive equipment from external magnetic fields.

Question 28

True or False: All magnets are attracted to all metals.

Answer 28

False

Question 29

What is magnetic hysteresis?

Answer 29

The lag between changes in the magnetization of a material and changes in the magnetic field.

Question 30

What type of magnet is made from a material that retains its magnetism after the external magnetic field is removed?

Answer 30

Permanent magnet

Question 31

Multiple Choice: Which of the following is a type of magnetic material? A) Aluminum B) Steel C) Plastic D) Wood

Answer 31

B) Steel

Question 32

What is the term for the distance between two consecutive peaks of a magnetic wave?

Answer 32

Wavelength

Question 33

Fill in the blank: The magnetic field inside a solenoid is ______ and ______.

Answer 33

uniform; strong

Question 34

What is the role of a magnetic field in a transformer?

Answer 34

To transfer energy between the primary and secondary coils.

Question 35

True or False: The strength of a magnetic field decreases with distance from the magnet.

Answer 35

True

Question 36

What is the main difference between temporary and permanent magnets?

Answer 36

Temporary magnets lose their magnetism quickly, while permanent magnets retain their magnetism.

Question 37

Fill in the blank: The magnetic field lines are ______ in regions of strong magnetic fields.

Answer 37

closely spaced

Question 38

What is the principle of operation of a motor based on?

Answer 38

The interaction between a magnetic field and an electric current.

Question 39

Multiple Choice: Which of the following describes a magnetic monopole? A) A magnet with only one pole B) A magnet with both poles C) A magnet that is permanently magnetized D) A magnet that can be turned off

Answer 39

A) A magnet with only one pole

Question 40

What phenomenon occurs when a magnet is dropped and loses its magnetism?

Answer 40

Demagnetization