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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 $ϕ = 5 t - 6 t + 9$ . The ratio of E.M.F. at $t = 0 s$ to $t = 0.5 s$ will be

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Answer:

Solution:

$E = - \frac{d ϕ}{d t}$

$E = - \frac{d}{d t} (5 t - 6 t + 9)$

$E = 6 - 10 t$

$t = 0 s, E (0) = 6 - 0 = 6 V$

$t = 0.5 s, E (0.5) = 6 - 5 = 1 V$

$\frac{E (0)}{E (0.5)} = \frac{6}{1}$

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

⏱ 2mℹ️ Source: PYQ_2020

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