Question

The circuit below is made up using identical light bulbs. The light bulb of maximum brightness among the following will be

• A. $A$
• B. $C$
• C. $D$
• D. $E$

Answer 1

The correct option is B $C$

Let potential at $P$ is $V$ and that at $Q$ is zero.
Thus, the potential across each resistor is shown in the circuit.
The brightness of a bulb is proportional to the power supplied to the bulb i.e $P=\frac{V^2}{R}$
Clearly, potential difference across bulb $C$ $(V_C=2V/3)$ is maximum. So, it will have maximum brightness.