Question

In which of the following circuits the bulb will glow?

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is D D

For circuit A, the switch is open so no current will flow.
In circuit B, a wire is cut in between so again there will not be any flow of current.
In circuit C, there is no energy source connected so there will not be any current although it looks as if everything is connected.
In circuit D, all parts are connected and there is a source of electricity that will keep the current flow continuous. Hence, bulb will glow.