CUET · PHYSICS · PYQ PAPER 2025
A long straight wire carries a current of 12 A. Another straight wire of length 5 cm placed parallel to it at a distance of 5 cm, carries a current of 2 A. The magnetic force on the smaller wire is
- A \( 3.4 \times 10^{-6} \text{ N} \)
- B \( 4.8 \times 10^{-6} \text{ N} \)
- C \( 2.4 \times 10^{-6} \text{ N} \)
- D \( 9.6 \times 10^{-7} \text{ N} \)
Answer & Solution
Correct Answer
(B) \( 4.8 \times 10^{-6} \text{ N} \)
Step-by-step Solution
Detailed explanation
\(F = \frac{\mu_0 I_1 I_2 L}{2 \pi r}\) \(F = \frac{(4 \pi \times 10^{-7} \text{ T} \cdot \text{m/A}) (12 \text{ A}) (2 \text{ A}) (0.05 \text{ m})}{2 \pi (0.05 \text{ m})}\) \(F = 4.8 \times 10^{-6} \text{ N}\)
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