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Q.

An iron rod of 0.2 cm2 cross-sectional area is subjected to a magnetizing field of 1200 A m-1 . The susceptibility of iron is 599. The magnetic flux produced is

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a

0.904 x 10-5 Wb

b

0.904 Wb

c

1.81 x 10-5 Wb

d

5.43 x 10-5 Wb

answer is B.

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Detailed Solution

μ=μ0(1+χ) or μ=4π x 10-7(1+599)

or μ=7.536 x 10-4 TmA-1

B=μH=7.536 x 10-4 x 1200 T

ϕ=BA=7.536 x 10-4 x 1200  x 0.2 x 10-4 Wb

=1.81 x 10-5 Wb

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