A rectangular coil of 100 turns and size 0.1m×0.05m is placed perpendicular to a magnetic field of 0.1T. If the field drops to 0.05T in 0.05 second, the magnitude of the e.m.f. induced in the coil is.
A
0.5V
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B
√3V
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C
√0.6V
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D
√6V
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Solution
The correct option is B0.5V
Given : N=100 turns Δt=0.05 s
Change in magnetic field ΔB=0.1−0.05=0.05 T
Area of coil A=0.1×0.05=5×10−3m2
Thus magnitude of change in flux Δϕ=AΔB=5×10−3×0.05=2.5×10−4Wb