1Awhich of the Following Will Be Attracted to a Magnet?

HELP

1aWhich of the following will be attracted to a magnet?

bWhat makes magnets push and pull against each other?

cThe two sentences below are wrong. Write them correctly. Do not change the underlined sections.

iMagnets repel each other when a north pole pushes against a south pole.

iiSimilar poles on two different magnets will always attract each other.

dSteel is a magnetic material. What substance in steel makes it magnetic?

CORE

2aThe diagram shows the ends of a large horseshoe magnet.

Describe what will happen to each of the following objects if placed at point X:

ia magnetic needle

iian aluminium rod.

bWhat exists between the two poles of the magnet around the area marked X?

cPlastic letters can be bought that stick onto fridges. Explain why they stick onto the fridge door.

dOn a bar magnet, where is the magnetism strongest?

eJames is using his magnet to attract objects. Here are his results:

Steel screw – not attracted.

Nickel earring – attracted.

Aluminium can – not attracted.

Iron hinge – attracted.

iWhich of his observations are correct and which are not?

iiJames tried a rusty screw. It was attracted to the magnet. Explain why it was attracted.

iiiJames used the magnet to investigate some magnetic fields using iron filings. He put the magnet inside a plastic bag. Why was this a good idea?

This worksheet may have been altered from the original on the CD-ROM.

EXTENSION

3The diagrams show pairs of magnets put close together.Lines of force are shown.

aiIn diagram X, what must be true about poles A and B?

iiWhich letter, M (on diagram X) or P (on diagram Y), shows the position of the strongest magnetic field?

biIn diagram Y, what must be true about poles C and D?

iiWhat must be true about the strength of the magnetic field at point P?

ciIn diagram Z, write down the type of pole there would be at poles R, S, T and U.

iiWhere would the magnetic field be at its strongest?

iiiWhat feature, about the space taken up by magnetic fields, cannot be seen from the diagrams?

dIn diagram Y, a steel ball bearing is placed at point P, exactly in the centre between the two magnetic poles.

iWhat will happen to the ball bearing?

iiWhat will happen to the ball bearing if the right hand magnet is carefully but very quickly removed?

This worksheet may have been altered from the original on the CD-ROM.