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Q.

Two identical short bar magnets, each having magnetic moment of  10 Am2, are arranged such that their axial lines are perpendicular to each other and their centres along the same straight line in a horizontal plane. If the distance between their centres is 0.2m, the resultant magnetic induction at a point midway between them is μ0=4π x 10-7 Hm-1

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a

2 x 10-7 T

b

5 x 10-7 T

c

2 x 10-3 T

d

5 x 10-3 T

answer is D.

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Detailed Solution

From figure, Bnet=B12+B22=μ04π.2Md32+μ04π.Md32=5.μ04π.Md3=5 x 10-7 x 100.13=5 x 10-3 T
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Two identical short bar magnets, each having magnetic moment of  10 Am2, are arranged such that their axial lines are perpendicular to each other and their centres along the same straight line in a horizontal plane. If the distance between their centres is 0.2m, the resultant magnetic induction at a point midway between them is μ0=4π x 10-7 Hm-1