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  4. A coil having an area A0 is placed in a magnetic field which changes from B0 to 4 B0 in time interval t. The emf induced in the coil will be

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Q. A coil having an area $A_{0}$ is placed in a magnetic field which changes from $B_{0}$ to $4 B_{0}$ in time interval $t$. The emf induced in the coil will be

Electromagnetic Induction

Solution:

$\phi_{0}=B_{0} A_{0}$
$\phi_{f}=4 B_{0} A_{0} ; \varepsilon=\frac{\Delta \phi}{\Delta t}=\frac{3 B_{0} A_{0}}{t}$