SSC JE Electrical Engineering 24 Jan 2018 Evening Paper

Question : 126 of 200

Marks: +1, -0

What will be the magnitude of induced EMF (in V) in a coil that has 200 square loops, each of side 5 cm and placed normal to a magnetic field?
The magnetic field increases at the rate of 4 Weber per sq. meter.

Validate

Solution:

Magnetic flux increases at the Rate of 4 weber/sq meter.

{dϕ}/{dt}={dβ}/{dt}×A

A = Cross section Area
= 4 × (5 × 10

^{– 2}

)2
= 1 × 10

^{– 2}

Emf =

N{dϕ}/{dt}

= 200 × 10

^{– 2 }

= 2V

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