NEET 2019 · PhysicsPower splitPrevious Year Question
Six similar bulbs are connected as shown with a DC source of emf E and zero internal resistance. The ratio of power consumed when (i) all glow to (ii) when two of section A and one of section B glow, is:
Answer: (B) 9 : 4. \textbf{Answer:} (2) 9 : 4 \textbf{Solution:} Sections A and B (each 3 bulbs in parallel) are in series.
- A.4 : 9
- B.9 : 4✓
- C.1 : 2
- D.2 : 1
Correct Answer
(B) 9 : 4
Solution & Explanation
\textbf{Answer:} (2) 9 : 4 \textbf{Solution:} Sections A and B (each 3 bulbs in parallel) are in series. (i) All on: R = R/3 + R/3 = 2R/3 P_i = 3E/(2R). (ii) 2 in A (R/2) + 1 in B (R) = 3R/2 P_ii = 2E/(3R). Ratio = (3/2)/(2/3) = 9 : 4.
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