Magnetism

Question 1

North and north

Answer 1

Repel

Question 2

South and south

Answer 2

Repel

Question 3

South and north

Answer 3

Attract

Question 4

North and south

Answer 4

Attract

Question 5

Which way do magnetic fields go?

Answer 5

North to south

Question 6

What is a magnetic field?

Answer 6

An area surrounding a magnet that can exert a force on magnetic material

Question 7

What materials can magnetic fields work through?

Answer 7

Any non-metal

Question 8

How do you magnetise a metal?

Answer 8

Stroking it with a magnet several times

Question 9

What materials are magnetic?

Answer 9

Nickel, iron, steel, cobalt

Question 10

What is an electromagnet?

Answer 10

When an electric current passes through a coil of wire, the coil has a magnetic field around it

Question 11

How do you increase the strength of an electromagnet?

Answer 11

Putting a magnetic object through it. Increasing the current, making more coil

Question 12

What are some uses of electromagnets?

Answer 12

Hover trains - same poles to repel each other and hover, scrap yards - pick up magnetic metals to separate materials

Question 13

What are some advantages of electromagnets?

Answer 13

Can be switched on and off, strength can be controlled, reduces friction making it faster

Question 14

How do electromagnets work?

Answer 14

The button completes the circuit is switched on. This activates the electromagnet. It attracts the iron bar. The hammer hits the gong. The contact is parted which disconnect the circuits the electromagnet is no longer activated. The metal springs back and reconnects the circuit