CUET · PHYSICS · PYQ PAPER 2023
A solenoid has 100 turns and is of length 20 cm. It carries a current of 5A. The magnetic field in the middle of the solenoid is:
- A 3.14 mT
- B 310 mT
- C 62 mT
- D 314 mT
Answer & Solution
Correct Answer
(A) 3.14 mT
Step-by-step Solution
Detailed explanation
\( B = \mu_0 \frac{N}{L} I \) \( B = (4\pi \times 10^{-7} \text{ T}\cdot\text{m/A}) \frac{100}{0.2 \text{ m}} (5 \text{ A}) \) \( B = 3.14 \times 10^{-3} \text{ T} = 3.14 \text{ mT} \)
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