CUET · PHYSICS · PYQ PAPER 2025
A 25 cm long solenoid with 100 turns carries a current of 3 A. The flux density at the center of the solenoid is
- A \(3.2 \times 10^{-2} Wb / m ^2\)
- B \(4.8 \times 10^{-3} Wb / m ^2\)
- C \(1.51 \times 10^{-3} Wb / m ^2\)
- D \(6.61 \times 10^{-2} Wb / m ^2\)
Answer & Solution
Correct Answer
(C) \(1.51 \times 10^{-3} Wb / m ^2\)
Step-by-step Solution
Detailed explanation
\(n = N/L = 100 / 0.25 = 400 \text{ turns/m}\) \(B = \mu_0 n I = (4\pi \times 10^{-7}) \times 400 \times 3 = 1.51 \times 10^{-3} Wb / m ^2\)
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