You are given three bulbs of 25, 40 and 600 eat. Which of them has lowest resistance

25

watt bulb

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$40v

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60

watt bulb

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Solution

The correct option is C $60$ watt bulb
We know $P = \frac{V^{2}}{R}$
$⟹ R \propto \frac{1}{P}$
so $60$ watt bulb has lowest resistance

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