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Q.

Some magnetic flux is changed from a coil of resistance $10 Ω$ . 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 $q = \frac{Δ ϕ}{R}$

But, Area of i-t curve gives charge

$∴ Δ ϕ = R \times A r e a o f i - t c u r v e$

$∴ Δ ϕ = q R = \frac{1}{2} \times 4 \times 0.1 \times 10$

$∴ Δ ϕ = 2 w b$

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