4.3.2 Electromagnets BEST

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Diagnostic questions

Magnetic attraction

The needle of a plotting compass is a tiny magnet. It can be used to detect a magnetic field. The needle turns to point in the direction of a magnetic field.

a) Which plotting compass will detect a magnetic field? Choose ALL the right answers.

3 points

b) What is the best reason for your last answer(s)?

1 point

A There is electric charge in the wire.

B There is moving electric charge in the wire.

C Iron is a magnetic metal.

Clear selection

Current magnets

An electric current is moving through this wire. The electric current gives the wire a magnetic field. The magnetic field turns the needle of a plotting compass.

Which wire, or group of wires, makes the strongest magnetic field?

1 point

Clear selection

Coil field

There is an electric current moving through this coil of wire. The electric current gives the coil a magnetic field.

Some students investigate its magnetic field. This is what they find out.

2) What does the magnetic field look like when the current is off?

1 point

Clear selection

1) What does the magnetic field look like when the current is on?

1 point

Clear selection

Core strength

1) Which wire and core make the strongest electromagnet?

1 point

Clear selection

2) Which wire and core make an electromagnet that does not work?

1 point

Clear selection

Building electromagnets

The wire of an electromagnet is often wound round a core. Different types of wire can be used. Wire can be wound round in different ways and different sized currents used.

How do you make a stronger electromagnet? For each statement, choose one column to show what you think.

4 points

I am sure this is right

I think this is right

I think this is wrong

I am sure this is wrong

Put a bigger current through the coil.

Use bare wire.

Add more turns of wire.

Make the turns of wire closer together.

Clear selection

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