A bar of Iron I cm^2 in cross section has 10^{–4} wb of magnetic flux in it. If \mur = 2000. What is the magnetic field intensity in the bar?

SSC JE Electrical Engineering 2015 Paper

Question : 187 of 199

Marks: +1, -0

A bar of Iron I cm

^2

in cross section has

10^{–4}

wb of magnetic flux in it. If

µr = 2000

. What is the magnetic field intensity in the bar?

Solution:

Magnetic flux intensity

H↖{→}=B↖{→}/µ

B↖{→}=ϕ /A={10^{-4}× 10}/{1× 10^{-4}}=1

H↖{→}=1/ {4 π×10^{-7} 2000}=398{\AT / \m

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