P7 AI

Question 1

What are the two types of poles in all magnets?

Answer 1

North (or north seeking) pole and south (or south seeking) pole.

Question 2

What happens when like poles of two magnets are brought close together?

Answer 2

They repel each other.

Question 3

What happens when unlike poles of two magnets are brought close together?

Answer 3

They attract each other.

Question 4

Fill in the blank: Objects don’t need to be touching for a _______ to act between them.

Answer 4

non-contact force.

Question 5

What materials are considered magnetic materials?

Answer 5

• Iron
• Steel
• Nickel
• Cobalt

Question 6

What is the magnetic field of a magnet?

Answer 6

The area around a magnet where it can exert a force.

Question 7

How can magnetic fields be visually represented?

Answer 7

With magnetic field lines.

Question 8

Which direction do magnetic field lines go?

Answer 8

From north to south.

Question 9

What does it mean if magnetic field lines are closer together?

Answer 9

A stronger magnetic field.

Question 10

Where is the magnetic field strongest in a magnet?

Answer 10

At the poles.

Question 11

What is the function of a compass needle?

Answer 11

It points in the direction of any magnetic field.

Question 12

What happens to a compass when it is not near a magnet?

Answer 12

It always points north.

Question 13

Why does a compass point north?

Answer 13

Because it points in the direction of the Earth’s magnetic field.

Question 14

What are permanent magnets?

Answer 14

Magnets that create their own magnetic field.

Question 15

What is an induced magnet?

Answer 15

A magnet that turns into a magnet when it’s put into another magnetic field.

Question 16

What happens to induced magnets when the magnetic field is removed?

Answer 16

They quickly stop being magnets.

Question 17

True or False: Permanent magnets and induced magnets always attract each other.

Answer 17

True.

Question 18

Complete the analogy: Magnets are like _______ — surrounded by fields.

Answer 18

farmers.

Question 19

What is found around a wire that has a current passing through it?

Answer 19

A magnetic field

A magnetic field is generated when current flows through the wire.

Question 20

What does a current flowing through a wire create?

Answer 20

A magnetic field

This can be observed by using a compass.

Question 21

How can you visualize the magnetic field around a current-carrying wire?

Answer 21

By placing a compass near the wire

The compass will point in the direction of the magnetic field.

Question 22

What shape is the magnetic field around a wire?

Answer 22

Circles around the wire

The field lines form concentric circles.

Question 23

What is the Right-Hand Thumb Rule used for?

Answer 23

To determine the direction of the magnetic field

Point your right thumb in the direction of current and curl your fingers.

Question 24

What happens to the direction of the magnetic field when the current direction is reversed?

Answer 24

The direction of the magnetic field is reversed

Swapping the current direction changes the field direction.

Question 25

How does distance from the wire affect the strength of the magnetic field?

Answer 25

The closer you are to the wire, the stronger the magnetic field ## Footnote The strength diminishes with distance.

Question 26

What effect does increasing the current have on the magnetic field?

Answer 26

It increases the strength of the magnetic field ## Footnote More current leads to a stronger magnetic field.

Question 27

What is a solenoid?

Answer 27

A coil of wire ## Footnote It is formed by wrapping a wire into a coil.

Question 28

What is the characteristic of the magnetic field inside a solenoid?

Answer 28

Strong and uniform ## Footnote Uniform means the field has the same strength and direction everywhere.

Question 29

What happens to the magnetic field outside a solenoid?

Answer 29

It resembles the magnetic field around a bar magnet ## Footnote The field lines outside a solenoid are similar to those of a magnet.

Question 30

How does wrapping wire into a solenoid affect the magnetic field?

Answer 30

It increases the strength of the magnetic field ## Footnote Field lines around each loop align, strengthening the overall field.

Question 31

What can be added to a solenoid to further increase the magnetic field strength?

Answer 31

A block of iron ## Footnote An iron core enhances the magnetic field in the solenoid.

Question 32

What is a solenoid with an iron core called?

Answer 32

An electromagnet ## Footnote The iron core significantly increases the strength of the magnetic field.

Question 33

True or False: A magnetic field is created by a current-carrying wire.

Answer 33

True ## Footnote The relationship between current and magnetic fields is a fundamental principle of electromagnetism.

Question 34

Fill in the blank: The direction of the magnetic field can be determined using the _______.

Answer 34

Right-Hand Thumb Rule ## Footnote This rule helps visualize the relationship between current direction and magnetic field direction.

Question 35

What is meant by a magnetic field being 'uniform'?

Answer 35

The field has the same strength and direction everywhere ## Footnote This is a key characteristic of the field inside a solenoid.

Question 36

True or false? The force between a north pole and a south pole is attractive.

Answer 36

True

Question 37

True or false? A magnet always repels a magnetic material.

Answer 37

False

Question 38

In what direction do magnetic field lines point?

Answer 38

From north to south

Question 39

How can you draw a magnetic field pattern of a bar magnet using a compass?

Answer 39

By placing the compass around the magnet and tracing the direction of the needle

Question 40

Describe the behaviour of a compass that is far away from any magnets.

Answer 40

It points toward the Earth's magnetic north

Question 41

Explain how to use the right-hand thumb rule to find the direction of a magnetic field around a wire.

Answer 41

Point your right thumb in the direction of current flow; your fingers curl in the direction of the magnetic field lines

Question 42

What is a solenoid?

Answer 42

A coil of wire that produces a magnetic field when an electric current passes through it

Question 43

Sketch the shape of the magnetic field around a solenoid.

Answer 43

The field lines are similar to those of a bar magnet, with lines emerging from one end and looping around to the other

Question 44

How can you increase the strength of a solenoid's magnetic field?

Answer 44

By increasing the current, adding more turns to the coil, or using a ferromagnetic core