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Physics · 2025 · 1 mark
CBSE 2025 · Region 5 · Set 1 · Q6
The magnetic flux linked with a coil changes with time t as φ=(8 t^2+5 t +7), where t is in seconds and φ is in Wb. The value of emf induced in the…
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
(D)
$\displaystyle 69$ V
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.