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Question

For the circuit shown, a shorting wire of negligible resistance is added to the circuit between points A and B.
 When this shorting wire is added, bulb-3 goes out. Which bulbs (all identical) in the circuit brighten?


  1. only bulb 2
  2. only bulbs 1 and 4
  3. only bulbs 2 and 4
  4. only bulb 4


Solution

The correct option is B only bulbs 1 and 4
l1 and l4  increases. (effective resistance in their respective branches will reduce.

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