CUET · PHYSICS · PYQ PAPER 2025
Three resistors, each of resistance R, are arranged in the following different combinations with a source of emf E. Arrange them in the decreasing order of power dissipation:
(A) Three resistors in series
(B) Three resistors in parallel
(C) One resistor in series with two resistors in parallel
(D) One resistor in parallel with two resistors in series
Choose the correct answer from the options given below:
- A (D), (B), (A), (C)
- B (B), (D), (C), (A)
- C (A), (C), (D), (B)
- D (B), (C), (D), (A)
Answer & Solution
Correct Answer
(B) (B), (D), (C), (A)
Step-by-step Solution
Detailed explanation
\(R_{eq,A} = R+R+R = 3R\) \(P_A = E^2 / (3R)\) \(R_{eq,B} = 1/(1/R+1/R+1/R) = R/3\) \(P_B = E^2 / (R/3) = 3E^2 / R\) \(R_{eq,C} = R + (R \cdot R)/(R+R) = R + R/2 = 3R/2\) \(P_C = E^2 / (3R/2) = 2E^2 / (3R)\) \(R_{eq,D} = (R \cdot (R+R))/(R+(R+R)) = (R \cdot 2R)/(3R) = 2R/3\)…
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