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Let r be the distance of a point on the axis of a bar magnet from its centre.

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

(a) 1/r

(b) 1/r2

(c) 1/r3

(d) none of these.

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(d) none of these.

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