Question

33. In this circuit 'R' is a Rheostat. What happens to the brightness of the bulb if 'R' is
increased or decreased ?
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Answer 1

Explanation:

decrease, I guess. hopefully it matched with your answer.

Answer 2

Explanation:

As resistance of the rheostat increases, the total resistance in parallel will increase. Hence potential difference across the parallel bulb Q increases, therefore BRIGHTER.