13.)A closely wound flat circular coil of 25 turns ofwire has diameter of 10 cm and carries a currentof 4 ampere. Determine the magnetic flux densityat the centre of the coil :-(1) 1.679 x 10-5 T (2) 2.028 x 104 T(3) 1.257 x 10-3 T (4) 1.512 x 10-6 T

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