CUET · PHYSICS · PYQ PAPER 2025
The overhead horizontal power transmission line carries a current of 75 A from east to west direction. The magnetic field above it at a vertical distance of 1.2 m will be
- A \( 1.25 \times 10^{-5} \text{ T} \), towards south
- B \( 4.4 \times 10^{-5} \text{ T} \), towards west
- C \( 6.25 \times 10^{-5} \text{ T} \), towards north
- D \( 1.25 \times 10^{-5} \text{ T} \), towards north
Answer & Solution
Correct Answer
(A) \( 1.25 \times 10^{-5} \text{ T} \), towards south
Step-by-step Solution
Detailed explanation
\(B = \frac{\mu_0 I}{2\pi r}\) \(B = \frac{4\pi \times 10^{-7} \times 75}{2\pi \times 1.2} = 1.25 \times 10^{-5} \text{ T}\), towards north
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