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Q.

The circuit shown in the figure contains unidentical batteries and a bulb of unknown resistance R. For the bulb to have maximum brightness

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a

Its resistance should be 1 Ω

b

Its resistance should 2 Ω

c

Current through bulb should be 6 Ampere

d

Current through bulb should be 9 Ampere

answer is A.

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Detailed Solution

Equivalent circuit diagram effective internal resistance r=1ΩFor maximum brightness of bulbR=r⇒R=1Ω
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