Question

Power consumed by the same bulb when switch S is opened is

Answer 1

Answer:

Resistance is r

all bulb

First switch is closed

Req = 3r/2

current in b is half

I = e/3r/2

I = 2e/3r

Ib = e/3r

Power = i^2 R

P = e^2/9r

2

Switch open

Req = 2r .

I = e/2r

P = e^2/4r

Power = 9P/4

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