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Standard X

Physics

Faraday's Law

A coil of are...

Question

A coil of area 0.4 $m^{2}$ has 100 turns. A magnetic field of 0.04 Wb $m^{-} 2$ is acting normal to the soil surface. If this magnetic field is reduced to zero in 0.01s. then the induced emf in the coil is

160V

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250V

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270V

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320V

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Solution

The correct option is A 160V
Here,
$A = 0.4 m^{2}, N = 100, d B = 0.04 W b m^{- 2} d t = 0.01 s$
As $E = \frac{d ϕ}{d t} = N A \frac{d B}{d t} = 100 \times 0.4 \times \frac{0.04}{0.01} = 160 V$

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A coil of area 0.4 m2 has 100 turns. A magnetic field of 0.04 Wb m−2 is acting normal to the soil surface. If this magnetic field is reduced to zero in 0.01s. then the induced emf in the coil is

The correct option is A 160VHere, A=0.4m2,N=100,dB=0.04Wbm−2dt=0.01sAs E=dϕdt=NAdBdt=100×0.4×0.040.01=160V

A coil of area 0.4 $m^{2}$ has 100 turns. A magnetic field of 0.04 Wb $m^{-} 2$ is acting normal to the soil surface. If this magnetic field is reduced to zero in 0.01s. then the induced emf in the coil is

The correct option is A 160V
Here,
$A = 0.4 m^{2}, N = 100, d B = 0.04 W b m^{- 2} d t = 0.01 s$
As $E = \frac{d ϕ}{d t} = N A \frac{d B}{d t} = 100 \times 0.4 \times \frac{0.04}{0.01} = 160 V$