Four identical bar magnets were dipped in a heap of iron fillings one by one. Which one of the following is the strongest magnet?


(a)                                                            (b)

                      (c)                                                            (d)

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answer is A.

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Detailed Solution

Four identical bar magnets were dipped in a heap of iron fillings one by one, of which magnet (a) is the strongest magnet.
The magnetic strength of a bar magnet depends on the material of which it is made and also on the state of magnetisation.Depending on the above two factors the strength of two bar magnets can be different even though they look same .Maximum iron filings are attracted to it compared to others when magnets are dipped in a pile of iron filings. Since it has attracted the most iron filings, iron bar (a) seems to be the strongest magnet.[1]

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