# In the diagram above, if the south-poles of two magnets stroke a steel bar

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## In the diagram above, if the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be

A. north and south.

B. south and south.

C. north and north.

D. south and north.

C

## EXPLANATION…

Remember, like poles repel, while unlike poles attract. Double-stroking the bar, starting from the middle to the edges will drag opposite magnetic poles to these edges leaving them as north – north and the center as south.

### Now for the right answer to the above question:

1. Option A is incorrect. polarities at the edges cannot possibly be different.
2. Option B is incorrect. not south – south because the stroking is usually from the center to the edges.
3. C is correct. yes, north – north, the south poles will push and drag opposite poles towards the edges.
4. D is not the correct answer. polarities at the edges cannot possibly be different.

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• Double stroking is usually done from the middle outward, leaving the edges with respective opposite poles to those of each of the stroking magnet.
• Polarities at the edges will only be opposite if the stroking poles are different, otherwise, if they are the same as in this question, then the poles at the edges will be the same.

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/ culled from 2018 JAMB-UTME physics question 36 /

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