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Q.

Two bar magnets of different lengths produce magnetic field induction of same magnitude at points on the axial line, at the same distance in each case. Then

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a

Magnetic moment is same for both magnets

b

Magnetic moment is more for short magnet

c

Magnetic moment is more for longer magnet

d

We cannot decide which has more magnet moment

answer is B.

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Detailed Solution

Magnetic field on the axial line of a bar magnet is given byB=μ04π2Mdd2-l22 if two magnets produce same magnetic field M1M2=d2-l122d2-l222 if l1>l2 then M1
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