A long solenoid of radius $2\, cm$ has $100\, turns/cm$ and carries a current of $5\,A$. A coil of radius $1\, cm$ having $100\, turns$ and a total resistance of $20\,\Omega $ is placed inside the solenoid coaxially. The coil is connected to a galvanometer. If the current in the solenoid is reversed in direction, find the charge flown through the galvanometer
Medium
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Induced charge $=\frac{\mathrm{d} \phi}{\mathrm{R}} $
$= \frac{2 \mathrm{NAB}_{\mathrm{s}}}{\mathrm{R}} $
$=\frac{2 \times 100 \times \pi \times\left(1 \times 10^{-2}\right)^{2} \times \mu_{0} \mathrm{nI}}{20}$
$=2 \times 10^{-4} \mathrm{\,C}$
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