Questions
A coil has 2000 turns and area of 70 cm2. The magnetic field perpendicular to the plane of the coil is 0.3 Wb/m2 and takes 0.1 s to rotate through 1800. The value of the induced e.m.f. will be
detailed solution
Correct option is B
e=−NBAcosθ2−cosθ1Δt=−2000×0.3×70×10−4cos180∘−cos0∘0.1⇒e=84 VTalk to our academic expert!
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A loop, having area 20cm2, is made of thin copper wire. If is placed in a uniform magnetic field of induction 1.5 Tesla with its plane perpendicular to the field. If area of the loop increases to 30 cm2 in 0.5 second, average emf induced in the loop is
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