Let \( r \) be the distance of a point on the axis of a bar P magne...

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Let \( r \) be the distance of a point on the axis of a bar
P magnet from its centre. The magnetic field at such a

W point is proportional to
(a) \( \frac{1}{r} \)
(b) \( \frac{1}{r^{2}} \)
(c) \( \frac{1}{r^{3}} \)
(d) none of these.
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