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  4. In a coil of resistance 20 Ω, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil is :-

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Q. In a coil of resistance $20 \,\Omega$, the induced current developed by changing magnetic flux through it, is shown in figure as a function of time. The magnitude of change in flux through the coil is :-Physics Question Image

Electromagnetic Induction

Solution:

Charge flown $=\frac{\Delta \phi}{ R }$
Area of $I - t$ curve $=\frac{\text { change in flux }}{ R }$
$\Rightarrow $ change in flux $=\frac{1}{2} \times 2 \times 0.1 \times 20=2 \,wb$