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A short current carrying solenoid has a magnetic dipole moment M. P is a point on its axial line at a distance d from the north-pole and at a distance 2d from the south-pole. The magnetic induction at P is

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a

μ04π3Md3

b

μ04π3M4d3

c

μ 4π2Md3

d

μ04π3M8d3

answer is B.

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Detailed Solution

length of the dipole is d and distance of the point from the center is 3d2 field on the axial line =μ04π2Mxx2-l22 here x =3d2 and l =d2

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