ElectroMagnetic InductionHard
Question
A closely wound flat circular coil of 25 turns of wire has diameter of 10 cm which carries current of 4 amperes, the flux density at the centre of a coil will be :
Options
A.1.256 × 10-3 tesla
B.1.679 × 10-5 tesla
C.1.512 × 10-5 tesla
D.2.28 × 10-4 tesla
Solution
Flux density, B = 
× n
= 6.31 × 10-3 Wb
× n= 6.31 × 10-3 Wb
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