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A current of ...

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A current of 1 A is flowing on the sides of an equilateral triangle of side 4.5 ×10 -2 m. The magnetic field at the centre of the triangle will be : (1) 2 ×10 -5 Wb/m2 (2) Zero (3) 8 ×10 -5 Wb/m2 (4) 4 ×10 -5 Wb/m2

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Standard XII Physics