CUET · PHYSICS · PYQ PAPER 2023
The magnetic flux density at a point on the axis of a long solenoid having 1000 turns \(/ m\) when it is carrying a current of 3.4 A is nearly,
- A \(1.4 \times 10^{-3} T\)
- B \(2.8 \times 10^{-4} T\)
- C \(3.5 \times 10^{-4} T\)
- D \(4.4 \times 10^{-3} T\)
Answer & Solution
Correct Answer
(D) \(4.4 \times 10^{-3} T\)
Step-by-step Solution
Detailed explanation
\(B = \mu_0 n I\) \(B = (4\pi \times 10^{-7} \text{ T m/A}) (1000 \text{ turns/m}) (3.4 \text{ A})\) \(B \approx 4.27 \times 10^{-3} \text{ T}\) \(B \approx 4.4 \times 10^{-3} \text{ T}\)
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