CUET · PHYSICS · PYQ PAPER 2025
A wire of resistance 20 Ω is bent to form a complete circle. What will be its resistance between two diametrically opposite points?
- A 40 Ω
- B 20 Ω
- C 10 Ω
- D 5 Ω
Answer & Solution
Correct Answer
(D) 5 Ω
Step-by-step Solution
Detailed explanation
Resistance of each semicircle \( = \frac{20 \ \Omega}{2} = 10 \ \Omega \). Equivalent resistance \( R_{eq} = \frac{R_1 \times R_2}{R_1 + R_2} = \frac{10 \ \Omega \times 10 \ \Omega}{10 \ \Omega + 10 \ \Omega} = \frac{100 \ \Omega^2}{20 \ \Omega} = 5 \ \Omega \).
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