A closely wound flat circular coil of 25 turns of wire has diameter of 10cm and carries a current of 4 amperes. determine the magnetic flux density at the centre of the coil:-
A
1.679×10−5T
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B
2.028×10−4T
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C
1.257×10−3T
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D
1.512×10−6T
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Solution
The correct option is A1.257×10−3T The magnetic flux density at the center of coil: