CUET · PHYSICS · PYQ PAPER 2025
The magnitude of magnetic field inside a solenoid of length L = 0.3 m having N = 800 turns carrying a current of I = 6 A is
- A 2.03 T
- B 60.3 Mt
- C 20 mT
- D 6.03 T
Answer & Solution
Correct Answer
(C) 20 mT
Step-by-step Solution
Detailed explanation
\( B = \mu_0 \frac{N}{L} I \) \( B = (4\pi \times 10^{-7} \, \text{T}\cdot\text{m/A}) \frac{800}{0.3 \, \text{m}} (6 \, \text{A}) \) \( B \approx 20.1 \times 10^{-3} \, \text{T} = 20 \, \text{mT} \)
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