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Byju's Answer

Standard XII

Physics

Magnetic Flux and Faraday's Law

A coil of are...

Question

A coil of area $A_{0}$ is lying in such a magnetic field whose value changes from $B_{0}$ to $4 B_{0}$
in $t$ seconds. The induced emf in the coil will be :

\frac{4 B_{0}}{A_{0} t}

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\frac{4 B_{0} A_{0}}{t}

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\frac{3 B_{0} A_{0}}{t}

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\frac{3 B_{0}}{A_{0} t}

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Solution

The correct option is D $\frac{3 B_{0} A_{0}}{t}$
Induced emf $=$ rate of change of flux

$= \frac{ϕ_{2} - ϕ_{1}}{t} = \frac{4 B_{o} A_{o} - B_{o} A_{o}}{t} = \frac{3 B_{o} A_{o}}{t}$

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A coil of area A0 is lying in such a magnetic field whose value changes from B0 to 4B0 in t seconds. The induced emf in the coil will be :

The correct option is D 3B0A0tInduced emf = rate of change of flux =ϕ2−ϕ1t=4BoAo−BoAot=3BoAot

A coil of area $A_{0}$ is lying in such a magnetic field whose value changes from $B_{0}$ to $4 B_{0}$
in $t$ seconds. The induced emf in the coil will be :

The correct option is D $\frac{3 B_{0} A_{0}}{t}$
Induced emf $=$ rate of change of flux

$= \frac{ϕ_{2} - ϕ_{1}}{t} = \frac{4 B_{o} A_{o} - B_{o} A_{o}}{t} = \frac{3 B_{o} A_{o}}{t}$