CUET · PHYSICS · PYQ PAPER 2025
Two long and parallel straight wires A and B carrying currents of 10.0 A and 5.0 A in the same direction are separated by a distance of 5.0 cm. Estimate the force on a 10 cm section of wire A.
- A \(2 \times 10^{-5} \text{ N}\)
- B \(2 \times 10^{-4} \text{ N}\)
- C \(10^{-5} \text{ N}\)
- D \(2 \times 10^{-3} \text{ N}\)
Answer & Solution
Correct Answer
(A) \(2 \times 10^{-5} \text{ N}\)
Step-by-step Solution
Detailed explanation
\(F = \frac{\mu_0 I_A I_B L}{2 \pi d}\) \(F = \frac{(4\pi \times 10^{-7} \text{ T} \cdot \text{m/A}) (10.0 \text{ A}) (5.0 \text{ A}) (0.1 \text{ m})}{2 \pi (0.05 \text{ m})}\) \(F = 2 \times 10^{-5} \text{ N}\)
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