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  4. At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 Gauss, in the next 5 s, then induced EMF in the loop is :

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Q. At time t = 0 magnetic field of 1000 Gauss is passing perpendicularly through the area defined by the closed loop shown in the figure. If the magnetic field reduces linearly to 500 Gauss, in the next 5 s, then induced EMF in the loop is :Physics Question Image

JEE MainJEE Main 2020Electromagnetic Induction

Solution:

$\frac{dB}{dt}=100$
$A=16 ×4 - 4 × 2 = 56 \,cm^{2}$
$\varepsilon=\frac{dB}{dt}A=100\times10^{-4}\times56\times10^{-4}$

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