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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACFaraday law/Lenz lawEasy2 minPYQ_2020

PhysicsEasysingle choice

The magnetic flux through a coil varies with time as $ϕ = 5 t^{2} + 6 t + 9$ . The ratio of emf at

$t = 3 s$ to $t = 0 s$ will be

Options:

Answer:

Solution:

EMF is $ε = - \frac{d ϕ}{d t}$

$ε = - (10 t + 6) V$

At $t = 3 s$ $ε_{1} = - 36 V$

At $t = 0 s$ $ε_{2} = - 6 V$

$\frac{ε_{1}}{ε_{2}} = \frac{- 36}{- 6}$

$\frac{ε_{1}}{ε_{2}} = 6$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:EMI/ACSubtopic:Faraday law/Lenz law

⏱ 2mℹ️ Source: PYQ_2020

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