First slide

Faraday's law of Electromagnetic induction

Question

Magnetic flux linked with a closed circuit of resistance 10 $Ω$ is given by $ϕ = (5 t^{2} - 4 t + 1)$ weber, when t is time in second. Then induced electric current at t = 0 is

Moderate

A

1.2 A
B

0.4 A
C

0.8 A
D

1.4 A

Solution

$ε = - \frac{d ϕ}{d t} = (4 - 10 t) volt At t = 0, ε = 4 volt$
$∴ At t = 0, i = \frac{4}{10} volt = 0.4 volt.$

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