magnetism and electromagnetism (p2)

Question 1

How will like poles (north & north or south & south) behave when they interact?

Answer 1

They will repel and push away from each other

Question 2

How will opposite poles (north & south or south & north) behave when they interact?

Answer 2

They will attract and pull towards each other

Question 3

Is the magnetic force a contact or a non-contact force?

Answer 3

Non-contact

Question 3

On a magnet, where is the magnetic field strongest?

Answer 3

The magnetic field is strongest at the poles of a magnetic

Question 4

What is a permanent magnet?

Answer 4

A magnet that produces its own magnetic field

Question 5

What is an induced magnet?

Answer 5

A material that becomes magnetic when it is placed in a magnetic field

Question 6

What is the difference between a permanent and an induced magnet?

Answer 6

A permanent magnet always has a magnetic field, but an induced magnet only becomes magnetic when it is placed into a magnetic field

Question 7

What is a magnetic field?

Answer 7

The region of space where a magnetic force will act on a magnet or a magnetic material

Question 8

What are the four types of magnetic material?

Answer 8

Iron, nickel, cobalt and steel

Question 9

Is the force between a magnet and a magnetic material attractive or repulsive?

Answer 9

Attractive

Question 10

What shape is the magnetic field around a bar magnet?

Answer 10

Many loops going from the North pole to the South pole

Question 11

In which direction should magnetic field lines point?

Answer 11

Magnetic field lines point towards the south pole of the magnet

Question 12

What is a magnetic compass?

Answer 12

A small bar magnet mounted on a pin so that it can spin around. It will point in the direction of a nearby magnetic field

Question 12

What does the strength of a magnetic field depend on?

Answer 12

The strength of the magnet AND the distance from the magnet

Question 13

Is the magnetic field around the Earth permanent or induced?

Answer 13

permanent

Question 14

What is a solenoid?

Answer 14

A coil of current-carrying wire

Question 15

What is an electromagnet?

Answer 15

A solenoid (coil of current-carrying wire) with an iron core

Question 16

What is the shape of the magnetic field around a wire?

Answer 16

Circular field lines around the wire

Question 17

What is the shape of the magnetic field around an electromagnet?

Answer 17

Similar shape to the field around a bar magnet: many loops going from one end to the other end

Question 18

How can a magnetic field be produced around a metal wire?

Answer 18

When current flows through the wire

Question 19

What does the strength of a magnetic field around a wire depend on?

Answer 19

The size of the current in the wire AND the distance from the magnet

Question 20

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] What is the motor effect?

Answer 20

When a conductor carrying a current is placed in a magnetic field the magnet producing the field and the conductor exert a force on each other

Question 21

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] In Fleming’s left hand rule, state what the thumb represents

Answer 21

Force (measured in Newtons, N)

Question 22

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] In Fleming’s left hand rule, state what the first finger represents

Answer 22

Magnetic flux density (measured in Tesla, T)

Question 23

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] In Fleming's left hand rule, state what the middle finger represents

Answer 23

Current (measured in Amps, A)

Question 24

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] What affects the size of the force on the wire in the motor effect?

Answer 24

The size of the magnetic field, the size of the current in the conductor, the length of the conductor that is in the magnetic field

Question 25

[𝗛𝗶𝗴𝗵𝗲𝗿 𝗧𝗶𝗲𝗿] Describe how an electric motor works

Answer 25

A coil of wire carrying a current in a magnetic field will experience a force on opposite sides of the wire - this is because the direction of the force depends on the direction of the current. These opposite forces cause the wire to rotate