Question

*Physics*
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Question:
A solenoid has a length of 1.23 m and inner diameter 3 cm. it has five layers of windings of 850 turns each and carries a current of 5.57 A. What is the magnitude of the magnetic field at the centre of the solenoid?


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Answer 1

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2⋅671×10−2T; 1⋅89×10−5Wb

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$\textsc{No. of turns, N=850 x 5, Area of cross section,}$

A=πr2=227(3×10−2)m2, l=lm, i=5A.

Magnetic field induction at the centre of solenoid is

B=μ0Nil/l=4π×10−7×(850×5)×5/1

=2⋅671×10−2T

$\textsc{Magnetic flux =BA}$

=2⋅671×10−2×227×(32×10−2)2

=1⋅89×10−5Wb

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