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An electric bulb is rated 220 V -100 W. If it is operated at 110 V then power consumed by it will be

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An electric bulb is rated 220 V -100 W. If it is operated at 110 V then power consumed by it will be

(a) 100 W

(b) 50 W

(c) 25 W

(d) 400 W

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Correct answer is (c) 25 W

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