CUET · PHYSICS · PYQ PAPER 2025
The magnetic field at a distance r from a long wire carrying current I is 0.4 T. The magnetic field at a distance 2r from the wire is
- A 0.2 T
- B 0.8 T
- C 0.1 T
- D 1.6 T
Answer & Solution
Correct Answer
(A) 0.2 T
Step-by-step Solution
Detailed explanation
\(B_{2r} = B_r \left(\frac{r}{2r}\right)\) \(B_{2r} = 0.4 \, \text{T} \times 0.5\) \(B_{2r} = 0.2 \, \text{T}\)
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