Questions
The magnetic field in a coil of 100 turns and 40 square cm area is increased from 1 T to 6 T in 2 s. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is
detailed solution
Correct option is C
e=−NΔBΔt⋅Acosθ=−100×(6−1)2×40×10−4cos0∘⇒|e|=1VTalk 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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