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Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

 

(a)  μ04π(2) Md3                (b)  μ04π(3) Md3

(c)  (2μ04π)Md3                 (d) μ04π(5) Md3