Question

Three identical bulbs are connected to a battery as shown in Fig. When the circuit is closed by means of the switch S, it is found that

• A. R will be bright, but Q and P dim
• B. P, Q and R, all will be equally bright
• C. Q and R will immediately burn out
• D. P will be bright, but Q and R dim

Answer 1

The correct option is D P will be bright, but Q and R dim

Three identical bulbs are connected to battery.When the current is closed in means of switches.It is found that P will be bright , but Q and R dim.This is because current will be more in bulb P and less current will be in Q and R as current will get divided in Q and R. We know that brightness in bulb is correctly proportional to current through that bulb