Chapter 23, Problem 1CQ

To determine

To explain: The brightness of bulb B, if bulb A is removed from the circuit.

Answer to Problem 1CQ

The brightness of bulb B does not change, when bulb A is removed from the circuit.

Explanation of Solution

Refer to FIGURE Q23.1 in the textbook.

Consider $I$ is the total current in the circuit, $R$ is the resistance of the bulb A and bulb B and $V$ is the applied voltage.

Since the two bulbs are connected in parallel, the potential difference $\Delta V$ across each bulb is must be same.

Redraw the FIGURE Q23.1 as shown in Figure 1 by removing bulb A.

When a bulb A is removed from the circuit, as the potential difference across the bulb B remains same that is $\Delta V$, therefore the brightness of the bulb B does not change.

Conclusion:

Thus, the brightness of bulb B does not change, when bulb A is removed from the circuit.