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  4. A coil of circular cross-section having 1000 turns and 4 cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10-2 Wb m-2 in 0.01 s. The e.m.f. induced in the coil is :

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Q. A coil of circular cross-section having 1000 turns and 4 $cm^2$ face area is placed with its axis parallel to a magnetic field which decreases by $10^{-2}$ Wb $m^{-2}$ in 0.01 s. The e.m.f. induced in the coil is :

JEE MainJEE Main 2014Electromagnetic Induction

Solution:

$\varepsilon = -\frac{d\phi}{dt}$
$\varepsilon = \frac{100\times4\times10^{-4}\times10^{-2}}{01}$
$= 4\times 10^{-1}\,V$