P7-Magnetism and electromagnetism

Question 1

What is a magnetic field

Answer 1

A region where are the magnets or magnetic materials experience a non-contact force

Question 2

In what direction do you draw magnetic field lines

Answer 2

North to south

Question 3

What is the meaning of magnetic field lines being closer together

Answer 3

That the magnetic field is stronger

Question 4

What is the meaning of magnetic field lines being further apart

Answer 4

This means that the magnetic field is weaker

Question 5

Where are the magnetic fields stronger

Answer 5

They are stronger at the poles of the magnet

Question 6

What is meant by the magnetic field at the poles being stronger on the magnet

Answer 6

That the magnetic forces are also stronger at the poles

Question 7

What happens to like poles

Answer 7

They will repel each other

Question 8

What will happen to you 2 unlike polls

Answer 8

They will affect each other

Question 9

How does a compass work

Answer 9

Inside a compass there is a tiny bar magnet. The North Pole of this magnet is attracted to the South Pole of any other magnet it is near. So the compass points in the direction of the magnetic field it is in

Question 10

What happens to a compass if you’re not near a magnet

Answer 10

The compass always points north.

This is because the Earth generates its own magnetic field, which shows the inside of the Earth must be magnetic

Question 11

How can you use a compass to work out magnetic field of a magnet

Answer 11

By moving the compass around a magnet and tracing its position on some paper it builds up a picture of the magnetic field

Question 12

What are the two types of magnets

Answer 12

Permanent magnets

induced magnets

Question 13

What is a permanent magnet

Answer 13

A magnet that produces its own magnetic field

Question 14

What is an induced magnet

Answer 14

They are magnetic material that turned into a magnet when they put into a magnetic field

Question 15

How does an induced magnet lose its magnetism

Answer 15

By taking away the magnetic field

Question 16

What happens when a current flows through a wire

Answer 16

A magnetic field is created around the wire

The field is made up of concentric circles perpendicular to the wire with the wire in the centre. The front of me

Question 17

What changes the strength of the magnetic field in wire

Answer 17

The current and the direction

Question 18

What makes the magnetic field stronger in awhile

Answer 18

The larger the current through the wire

the closer to the wire you are

Question 19

And how can you increase the strength of the magnetic field that a wire produces

Answer 19

By wrapping the wire into a coil called a solenoid

Question 20

Why does a solenoid strengthen the magnetic field of a wire

Answer 20

Because the field lines around each loop of wire lines up with each other

This results in loads of field lines pointing in the same direction that are very close to each to other

Question 21

How can you increase the field of a solenoid even more

Answer 21

By increasing the current flowing through the wire

If we increase the number of coils of the wire

By placing an iron core

Question 22

What is an electromagnet

Answer 22

A magnet whose magnetic field can be turned on and off with an electric current

Question 23

What is the motor affect

Answer 23

This is where a wire interacts with another magnetic field and a force is produced

This only happens when the wire is at a right angle to the magnetic field of the other object

Question 24

How does a current carrying coil of wire rotating a magnetic field

Answer 24

When a loop of wire carries a current

it will produce current, running in opposite directions on either side of the loop

When we put the loop between magnets The loop will start rotating because of the forces given off

When it gets to 90° it will stop rotating

We can make it is a full rotation if we use a split ring commutator