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  4. In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

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Q. In the following figure, the magnet is moved towards the coil with a speed $v$ and induced emf is $e$. If magnet and coil recede away from one another each moving with speed $v$, the induced emf in the coil will bePhysics Question Image

Electromagnetic Induction

Solution:

$\left(\frac{d \phi}{d t}\right)_{\text {In first case }}=e$
$\left(\frac{d \phi}{d t}\right)_{\text {relative velocity } 2 v}=2\left(\frac{d \phi}{d t}\right)_{ Icase }=2 e$
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