CUET · PHYSICS · PYQ PAPER 2025
A coil of 400 turns of effective area \(0.05 \text{ m}^2\) is kept perpendicular to a magnetic field of \(5 \times 10^{-3} \text{ T}\). When the plane of coil is rotated by \(90^\circ\) around any of its co-planar axis in 0.2 s in magnetic field, the emf induced in the coil is
- A \(0.2 V\)
- B \(0.05 V\)
- C \(0.1 V\)
- D \(0.5 V\)
Answer & Solution
Correct Answer
(D) \(0.5 V\)
Step-by-step Solution
Detailed explanation
\( |\varepsilon| = N \left| \frac{\Phi_f - \Phi_i}{\Delta t} \right| \) \( |\varepsilon| = N \frac{|B A \cos 90^\circ - B A \cos 0^\circ|}{\Delta t} \) \( |\varepsilon| = N \frac{|0 - B A|}{\Delta t} = N \frac{B A}{\Delta t} \)…
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