A) Brightness of the bulb \[{{B}_{1}}\] increases and that of \[{{B}_{2}}\] decreases
B) Brightness of the bulbs \[{{B}_{1}}\] and \[{{B}_{2}}\]increase
C) Brightness of the bulb \[{{B}_{1}}\] decreases and \[{{B}_{2}}\]increases
D) Brightness of the bulbs \[{{B}_{1}}\] and \[{{B}_{2}}\]decrease
Correct Answer: C
Solution :
When key K is opened, bulb B^ will not draw any current from the source, so that terminal voltage of source increases. Hence, power consumed by bulb increases, so light of the bulb becomes more. The brightness of bulb \[{{B}_{1}}\] decreases.
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