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

In which one of the following set-ups will the two magnets be attracted to each other?

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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

Sidney tied a bar magnet to a string and swung it about. It came to a rest after a while. In which direction would it be pointing at?

• North-East

• North-South

• East-West

• South-West

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?

• magnetic material

• non-magnetic material

• magnet

• not possible to tell

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?

• magnetic object

• magnet

• non-magnetic object

• not possible to tell

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

Which magnet is the weakest?

• K

• L

• M

• N

Which one of the following diagrams correctly shows the stroking method to magnetise an iron nail?

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Ryan stroked the iron nail 30 times with the magnet.  Three steel pins were attracted to the iron nail. What should Ryan do so that more steel pins will be attached to the iron nail?

• Stroke it harder with the same magnet.

• Stroke it more times with the same magnet.

• Drop the iron pin on the floor.

Study the three set-ups below carefully. Three identical iron nails were magnetised using the electrical method.

Arrange the electromagnets in order, starting with the one with the weakest magnetic strength.

• A, B, C

• B, C, A

• C, A, B

• B, A, C