Two capacitors R1 = 4Ω and R2 = 5Ω are connected in parallel across a
PHYSICS
JAMB 1994
Two capacitors R1 = 4Ω and R2 = 5Ω are connected in parallel across a potential difference. If P1 and P2 represent power dissipated in R 1 and R2 respectively, then the ratio P1 : P2 is
- A. 4 : 5
- B. 5 : 4
- C. 16 : 25
- D. 25 : 16
Correct Answer: B. 5 : 4
Explanation
P1 = \(\frac{V^2_1}{R_1}\) and P2 = \(\frac{V^2_2}{R_2}\)
P1R1 = P2R2
4P1 = 5P2
\(\frac{p_1}{p_2}\) = \(\frac{5}{4}\)
= 5 : 4
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