Question

Consider the circuit below. The bulb will light up if

• A. $S_1{S}_2$ and $S_3$ are all closed
• B. $S_1$ is closed but $S_2$ and $S_3$ are open
• C. $S_1$ and $S_3$ are closed but $S_2$ is open
• D. None of these

Answer 1

The correct option is B $S_1$ is closed but $S_2$ and $S_3$ are open

We know that the bulb will light up only if circuit is complete and current flows through the bulb.

Option A-

Bulb will not light up as it is short circuit.

Option B-

Bulb will light up as circuit is complete and current flows through the bulb.

Option C-

Bulb will not light up as it is short circuit.

Therefore, B is correct option.