Questions
A 800 turn coil of effective area is kept perpendicular to a magnetic field . When the plane of the coil is rotated by around any of its coplanar axis in 0.1 s, the emf induced in the coil will be
detailed solution
Correct option is A
Here N=800,A=0.05 m2 B=5×10-5 T,Δt=0.1 s Induced emf, ε=-ΔϕΔt=-ϕf-ϕiΔt ϕi=N(B→·A→)=800×5×10-5×0.05×cos0°=2×10-3 T m2 ϕf=0 ∴ ε=-0-2×10-30.1=2×10-2 V=0.02 VSimilar Questions
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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