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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)                  (b)

(c)  $\left(\frac{2{\mu }_{0}}{4\mathrm{\pi }}\right)\frac{M}{{d}^{3}}$                 (d)