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Q.

Some magnetic flux is changed from a coil of resistance 10Ω. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil is____Wb 

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answer is 2.

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Detailed Solution

The induced charge is q=ΔϕR

But, Area of i-t curve gives charge

∴   Δϕ=R×Area   of  i−t   curve

∴   Δϕ=qR=12×4×0.1×10

∴   Δϕ=2wb

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