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The circuit shownin Fig. 7.33 contains a...

The circuit shownin Fig. `7.33` contains a battery , a rheostat , and two identical lamps. What will happen to the brightness of the lamps if the resistance of the rheostat is increased?

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When resistance of rheostat is increased, the resistance of circuit increases, so current in main circuit decreases. As a result the potential difference across P decreases and that across Q increases, so brightness of bulb P decreases and that of Q increases.
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