Assertion :The 200 W bulb glows with more brightness than 100 W bulbs in parallel. Reason: A 100 watt bulb has more resistance than a 200 W bulb.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Here, Power $P = V^{2} / R o r R = V^{2} / P$
In parallel V will be same for both so $R \propto \frac{1}{P}$ .
Thus, 100 W bulb has more resistance than 220 W bulb.
Since, heat produced $H = (V^{2} / R) t$ , so 220 W has more brightness than 100 W bulb.

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