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  4. The magnetic flux linked with a coil (in Wb) is given by the equation φ =5t2+3t+16 The magnitude of induced emf in the coil at the fourth second will be

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Q. The magnetic flux linked with a coil (in Wb) is given by the equation $\phi =5t^{2}+3t+16$
The magnitude of induced emf in the coil at the fourth second will be

NEETNEET 2020Electromagnetic Induction

Solution:

$\phi=5t^{2}+3t+60$
$\left|\varepsilon\right|=\left|\frac{d\phi}{dt}\right|=10t+3$
At $t=4th \,sec$
$\left|\varepsilon\right|=40+3=43 $ volt