Two short bar magnets of magnetic moments M each are arranged at the opposite corners of a square of side d such that their centres coincide with the corners and their axes are parallel. If the like poles are in the same direction, the magnetic induction at any of the other corners of the square is

Image 40ABCD is a square of side d. Two bar magnets are arranged at the opposite corners B and D of the square. Consider the corner A of the square. The magnetic induction at a due to magnet M1Ba=μ04π⋅2Md3( along BA)Similarly, the magnetic induction at A due to magnet M2Be=μ04π⋅Md3 along ABResultant B=Ba−Be=μ04π×Md3.