Question

# A rectangular coil of $$200$$ turns and area $$100\,cm^{2}$$ is kept perpendicular to a uniform magnetic field of induction $$0.25\,T$$. If the field is reversed in direction in $$0.01$$ second, the average induced emf in the coil is :

A
106V
B
104V
C
102V
D
zero

Solution

## The correct option is D $$10^{2}V$$$$Emf=\dfrac { \Delta \phi }{ \Delta t }$$ = $$\dfrac { 2\times B\times A\times n }{ t }$$  = $$\dfrac { 2\times 0.25\times 100\times { 10 }^{ -4 }\times 200 }{ 0.01 }$$  = $$100 V$$  = $${ 10 }^{ 2 }V$$Physics

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