Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the b - Physics MCQ NEET 2019 2026 | ExamTest.live

hardMCQNEET 20192026Physics

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Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

Solution & Step-by-step Explanation

Let resistance of each bulb be R .(i) All glowing: Section A resistance = R /3, Section B = R /3 . Total R_{1} = 2 R /3 .Power P_{1} = E^{2} / R_{1} = 3 E^{2} /2 R .(ii) Two in A, One in B: Section A resistance = R /2, Section B = R . Total R_{2} = R /2 + R = 3 R /2 .Power P_{2} = E^{2} / R_{2} = 2 E^{2} /3 R .Ratio P_{1} / P_{2} = (3/2) / (2/3) = 9/4 .

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Six similar bulbs are connected as shown in the figure with a DC source of emf E and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section A and one from section B are glowing, will be:

4 : 9

9 : 4

1 : 2

2 : 1

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