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[" 38.A closely wound flat circular coil...

[" 38.A closely wound flat circular coil of "25" turns "],[" of wire has diameter of "10cm" and carries a "],[" current of "4" ampere.Determine the "],[" magnetic flux density at the centre of the "],[" coil; "-],[[" (a) "1.679times10^(-5)T," (b) "2.028times10^(-4)T],[" (c) "1.257times10^(-3)T," (d) "1.512times10^(-6)]]

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