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PhysicsNEET 2019Cells, EMF, internal resistance, combinations

Current Electricity

Six similar bulbs, each of resistance RR, are connected to a DC source of emf EE (zero internal resistance) in two groups of three bulbs each, section A and section B, with the three bulbs of each section in parallel with each other and the two sections in series with each other and the source. The ratio of the power consumed by the bulbs when (i) all six are glowing, to when (ii) only two bulbs from section A and one bulb from section B are glowing (the rest disconnected), will be:

  1. A.4:94:9
  2. B.9:49:4✓
  3. C.1:21:2
  4. D.2:12:1

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