Question

Let r be the distance of a point on the axis of a bar magnet from its center. The magnetic field at r is always proportional to ________.

1)
$1 {r}^{2}$
2)
$1 {r}^{3}$
3)
$1r$
4)
$not \: necessarily \: 1 {r}^{3} at \: all \: point$

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Answer 1

Answer:

4)not necessary 1r³at all point