Consider the diagram in which 
and B 3 are the three identical bulbs connected to a battery of steady emf with key k closed. What happens to the brightness of the bulbs B 1 and B 2 when the key is opened?
Text Solution
Verified by ExpertsThe correct answer is:
C
When key, k is opened, bulb B 2 will not draw any current form the source, so that terminal voltage of the source increases. Hence, power consumed by the bulb increases, so brightness of the bulb becomes more. The brightness of bulb B 1 decreases.
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