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Question: Answered & Verified by Expert

A circuit consists of three identical lamps connected to a battery as shown in the figure. When the switch S is closed then the intensities of lamps A and B

PhysicsCurrent ElectricityJEE Main
Options:
  • A will increase by eight times
  • B will decrease by two times
  • C will increase by more than two times
  • D will remain the same
Solution:
2927 Upvotes Verified Answer
The correct answer is: will increase by more than two times
After closing of  S C bulb or lamp become short circuited








potential across A and B before closing of S=V3

Potential across A and B after closing of S=V2

As PV2

PiPf= 49

Pf=Pi×94= 2.25 Pi

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