A) No change in the incandescence
B) Bulb \[{{B}_{1}}\] will become brighter
C) The bulb \[{{B}_{1}}\] will become less brighter
D) The bulb \[{{B}_{1}}\] may become brighter or dimmer depending upon the candle power of the bulb which is disconnected
Correct Answer: C
Solution :
Let the total current supplied by the battery in the given circuit be I. In that case, current in bulb \[{{B}_{1}}\] is I and in each of the bulbs\[{{B}_{2}}\]or\[{{B}_{3}}\]is\[\frac{I}{2}\]. When one resistance is removed from parallel, \[{{R}_{eq}}\]increases. The current supplied decreases, say it becomes\[I'\].This is also the current that now flows into \[{{B}_{2}}\](\[{{B}_{3}}\] having been removed). \[I'\]less than\[I\]but greater than\[\frac{I}{2}\]. So, the current through \[{{B}_{1}}\] decreases while that through\[{{B}_{1}}\]decreases.You need to login to perform this action.
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