SSC JE Electrical Engineering 23 Jan 2018 Evening Paper

Question : 116 of 200

Marks: +1, -0

For the figure shown below, the permeability in the core is 4 × 10

^{– 4}

Wb/A-turns-m. What is the value of flux density (in T) in the core?

Solution:

Magnetic flux density

H↖{→} ={NI}/L

L=2πa

H↖{→}={60×5}/{2×3.14×5×10^{-2}}

= 9.55 × 10^2

Magnetic flux density

B↖{→}

= µH↖{→}

=4×10^{-4}×9.55×10^2

= 382 Tesla

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