Four nails, A, B, C and D, are tested to find which makes the strongest permanent magnet.
One of the nails is placed against a bar magnet and the number of paper clips which the nail can support is recorded. The bar magnet is then removed and the number of paper clips remaining attached to the nail is recorded. Each nail is tested in turn.
Which nail becomes the strongest permanent magnet?
1 )
A
2 )
B
C
4 )
D
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