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Question

Plane of both loops circle and ellipse are held perpendicularly to the uniform magnetic field of strength B, Compare the magnetic flux passing through both loops if ϕc, the magnetic flux through the circular loop and ϕE, the magnetic flux through the elliptical loop given that area of both loops are same.

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A
ϕc=2.5ϕE
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B
ϕc=2.5
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C
ϕc=ϕE
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D
ϕE=2.5ϕc
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E
ϕE=2.5ϕc
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Solution

The correct option is B ϕc=ϕE
Magnetic flux linked with the circle
ϕC=B.ΔA=BAcos0=BA
Magnetic flux linked with the ellipse
ϕE=B.ΔA=BAcos0=BA
where ΔA is the area vector which is parallel to magnetic field as given that field is perpendicular to the planes of both loops that's why θ is taken 0,
from above two equation it is clear that ϕC=ϕE
as given magnetic field is same for both loops and area of both loops is equal.

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