In figure below, all the bulbs are identical. The bulb that lights most brilliantly is

1 only

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2 only

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2 and 4

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1 and 5

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Solution

The correct option is D 1 and 5
The brightness of a bulb is proportional to the power supplied to the bulb= $i^{2} R$
Since the bulbs are identical, the resistance of all of them is same.
Maximum current flows through 1 and 5 that further divides into bulbs 3,4 and 2.
Hence correct answer is option D.

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In figure below, all the bulbs are identical. The bulb that lights most brilliantly is

The correct option is D 1 and 5The brightness of a bulb is proportional to the power supplied to the bulb=i2RSince the bulbs are identical, the resistance of all of them is same.Maximum current flows through 1 and 5 that further divides into bulbs 3,4 and 2.Hence correct answer is option D.