CUET · PHYSICS · PYQ PAPER 2025
The armature coil of a generator has 20 turns and its area is \( 0.127 \, \text{m}^2 \). How fast approximately should it be rotated in a magnetic field of \( 0.2 \, \text{Wb m}^{-2} \) so that the peak value of induced emf is 160 V?
- A 20 rps
- B 50 rps
- C 100 rps
- D 200 rps
Answer & Solution
Correct Answer
(B) 50 rps
Step-by-step Solution
Detailed explanation
\( \mathcal{E}_{\text{peak}} = N B A (2 \pi f) \) \( f = \frac{\mathcal{E}_{\text{peak}}}{2 \pi N B A} \) \( f = \frac{160}{2 \pi (20)(0.2)(0.127)} \) \( f \approx 50 \, \text{rps} \)
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