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In a coil of resistance 10 $Ω$ a current is induced by changing the magnetic flux through it. The current induced as a function of time is shown in given figure. The magnitude of change in flux through the coil is

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15 Wb

20 Wb

24 Wb

25 Wb

answer is B.

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Detailed Solution

$q = \frac{Δ ϕ}{R} \Rightarrow Δ ϕ = R q = 10 \times$ Area Under graph $= 10 \times \frac{1}{2} \times 0.6 \times 8 = 24 W b$

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