CUET · PHYSICS · PYQ PAPER 2025
A straight long wire carrying a current of 30 A is placed in an external uniform magnetic field of \( 4 \times 10^{-4} \, T \) parallel to the current. The magnitude of the resultant magnetic field at a point 2 cm away from the wire is
- A \(5 \times 10^{-4} \, T \)
- B \(3 \times 10^{-4} \, T \)
- C \(2 \times 10^{-4} \, T \)
- D \(10^{-4} \, T \)
Answer & Solution
Correct Answer
(A) \(5 \times 10^{-4} \, T \)
Step-by-step Solution
Detailed explanation
\( B_{wire} = \frac{\mu_0 I}{2 \pi r} = \frac{4 \pi \times 10^{-7} \times 30}{2 \pi \times 0.02} = 3 \times 10^{-4} \, T \)…
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