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Q.

A solenoid is 1.5 m long and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly

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a

2.5×10−7 weber

b

6.31×10−6 weber

c

5.2×10−5 weber

d

4.1×10−5 weber

answer is B.

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Detailed Solution

ϕ=μ0niA=4π×10−7×30001.5×2×π2×10−22=6.31×10−6Wb
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