Q.
Three bulbs $B_{1}\ ,B_{2}$ and $B_{3}$ are connected to the main as shown in figure. How will the brightness of bulb $B_{1}$ be affected if $B_{2}\ $or ${\ B}_{3}$ are disconnected from the circuit?
A) Bulb $B_{1}$ become brighter
B) Bulb $B_{1}$ become dimmer
C) No change occurs in the brightness
D) Bulb $B_{1}$ becomes brighter if bulb $B_{2}$ is disconnected and dimmer if bulb $B_{3}\ $is disconnected.
Explanation
(b) If $B_{2}\ or\ B_{3}$ is disconnected, resistance is increased. Due to which current in the circuit is decreased. Therefore bulb $B,$ will become dimmer.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.