Magnets

A magnetic door stopper forces the door to remain open by ensuring that the door stays close to the wall. Which material is Part Z made of?

• steel

• wood

• copper

• aluminium

Answer explanation

Part Z must be made of a magnetic material.

Raju recorded the number of steel clips attracted to different part, W, X, Y and Z of a bar magnet. Which parts are likely the poles of the bar magnet?

• W and Z

• W and X

• X and Y

• Y and Z

Answer explanation

The poles of the bar magnet are the strongest.

Which two magnets will push each other away?

• 
• 

Answer explanation

Like poles repel

Which two magnets will pull each other together?

• 
• 

Answer explanation

Unlike poles attract

Which magnet(s) should be flipped over so that all three magnets are attracted to one another?

• A only

• B only

• A and B only

• C and D only

Answer explanation

The poles of a ring magnet are the top and the bottom.

Four magnets K, L, M and N were hung at different lengths from the rod.

Which magnet is the weakest?

• K

• L

• M

• N

Answer explanation

Magnet M is the closest to the tray of steel pins but it only attract 1 pin, so it is the weakest magnet.

Thomas hung four magnets of the same size above a tray of steel pins. Which magnet, A, B, C or D, is the strongest?

• A

• B

• C

• D

Answer explanation

Magnet D is the furthest from the tray of steel pins and it can attract 3 pins, so it is the strongest magnet.

Jane hung two bars side by side and observed that both bars are far apart. If bar X is a magnet, what is bar Y?

• Non magnetic material

• Magnetic material

• Magnet

• Unable to tell

Answer explanation

Like poles of 2 magnets repel, so both are magnets.

Greg hung two bars side by side and observed that the bars did not move at all. If bar X is a magnet, what is bar Z?

• Non magnetic material

• Magnetic material

• Magnet

• Unable to tell

Answer explanation

Magnet does not attract non magnetic material.

Xavier hung two bars side by side and observed that the bars are drawn to each other. If bar X is a magnet, what is bar Y?

• Non magnetic material

• Magnetic material

• Magnet

• Unable to tell

Answer explanation

Bar Y can be another magnet or a magnetic material.