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?

only bulb 2

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only bulb 4

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only bulbs 1 and 4

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only bulbs 2 and 4

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Solution

The correct option is C only bulbs 1 and 4
$l_{1}$ and $l_{4}$ increases. (effective resistance in their respective branches will reduce.

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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?

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

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?

The correct option is C only bulbs 1 and 4
$l_{1}$ and $l_{4}$ increases. (effective resistance in their respective branches will reduce.