Q&A - PSLE Science

[Nebbermind]

atutor2001:

This is a different problem related to mass. Similarly, a small permanent magnet will not be able to move (repel) a huge permanent magnet. However, if we chose to suspend the small magnet (i.e. magnetised nail) with a string and move the big magnet towards it, the nail will move away. Although in reality it is the big magnet that repels the nail, in science term, we also conclude that the nail will repel the big magnet. Otherwise we will bring a new dimension to this type of question i.e. light magnet cannot move (repel) heavy magnet.

I agreed with your pt.

atutor2001:

The question states that the compass moved. However, there is no clear indication that only 1 specific end of the compass needle will move towards the nail. Therefore, we cannot conclude that the movement is due to repulsion. The movement could also be due to attraction of the compass needle to a magnetic material (i.e. the nail that is still not magnetised)

Well, u can turn the nail around and see if the compass needle flip or not.

[P5G]

Please help.


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TIA.

[Sun_2010]

19 -1)

20 -3)

[P5G]

Please help.


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TIA.

[P5G]

Please help.


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TIA.

[P5G]

Please help.


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TIA.

[P5G]

Please help.


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TIA.

[P5G]

Please help.


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Should the answer be A, B and D only?

TIA.

[P5G]

Please help.


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TIA.

[P5G]

Please help.


http://i54.tinypic.com/2s0jrk3.gif\">

TIA.