CUET · PHYSICS · PYQ PAPER 2025
In the given setup of meter bridge, the null point D is obtained at a distance of 40 cm from end A. If a resistance of 10 \( \Omega \) is connected in series with \( R_1 \), the null points shift by 20 cm. The values of \( R_1 \) and \( R_2 \) respectively are
- A 8 \( \Omega \) and 12 \( \Omega \)
- B 12 \( \Omega \) and 8 \( \Omega \)
- C 6 \( \Omega \) and 4 \( \Omega \)
- D 6 \( \Omega \) and 9 \( \Omega \)
Answer & Solution
Correct Answer
(A) 8 \( \Omega \) and 12 \( \Omega \)
Step-by-step Solution
Detailed explanation
\( \frac{R_1}{R_2} = \frac{40}{100-40} = \frac{40}{60} = \frac{2}{3} \) \( R_1 = \frac{2}{3} R_2 \) \( \frac{R_1+10}{R_2} = \frac{40+20}{100-(40+20)} = \frac{60}{40} = \frac{3}{2} \) \( \frac{\frac{2}{3}R_2+10}{R_2} = \frac{3}{2} \) \( 2(\frac{2}{3}R_2+10) = 3R_2 \)…
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