Two identical light bulbs A and Ii are connected in series to a constant voltage

Question

Two identical light bulbs A and Ii are connected in series to a constant voltage source. Suppose a wire is connected across bulb B as shown. When the wire is connected across B, bulb A 5 V will go out. will bum half as brightly as before. will bum nearly four times as brightly as before. will bum as brightly as before. will bum twice as brightly as before. and bulb Ii will bum half as brightly as before. will go out. will bum as brightly as before. will bum nearly four times as brightly as before. will bum twice as brightly as before.

Explanation / Answer

Here the two identical bulbs of resistance R areconnected in series
so the total resistance Rt = 2R then the current in the circuit is i = V/2R if we connect the wire as shown in the figure it makes lowresistance path so the current choose this path then the total resistance is Rt = R (only) and the current in the circuit is i = V/R that is the current increased by twice so the brigthnessof bulb A incresed by twice in series conncetion then the choice is (5) where as the blub B is go out. then the choice is (2)

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