Four identical iron bars were dipped in a heap of iron filings one by one. Fig. 13.5 shows the amount of iron filings sticking to each of them.

(a) Which of the iron bar is likely to be the strongest magnet?
(b)Which of the iron bars is not a magnet? Justify your answer.

Explanation

The first iron bar is likely to be the strongest magnet as it has the maximum iron fillings attracted to the ends.

Iron bar (b) is not a magnet as it does not have any iron fillings attracted to it.