CBSE 2025 · Region 5 · Set 1 · Q6 · 1 mark
The magnetic flux linked with a coil changes with time $\displaystyle \mathrm{t}$ as $\displaystyle \phi=\left(8 \mathrm{t}^{2}+5 \mathrm{t}+7\right)$, where t is in seconds and $\displaystyle \phi$ is in Wb . The value of emf induced in the coil at $\displaystyle \mathrm{t}=4 \mathrm{~s}$ is:
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 69$ V
Electromagnetic InductionFaraday’s Law of InductionApplymcqeasy
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.