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A planar loop of wire rotates in a uniform magnetic field. Initially, at t=0, the plane of the loop is perpendicular to the magnetic field. If it rotates with a period of 10s about an axis in its plane then the magnitude of induced emf will be maximum and minimum, respectively at:

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a
2.5 s, 5.0 s
b
5.0 s, 7.5 s
c
2.5 s, 7.5 s
d
5.0 s, 10.0 s

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detailed solution

Correct option is A

∴ω=2πT=π5When ωt=π2    ∵ϕwill have minimum value and e  will be maximum  ⇒t=π2π5=2.5secWhen ωt=π    ∵ϕ will have maximum value and e  will be minimum  ⇒t=ππ/5=5 sec


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