Three identical lamps $L_1$, $L_2$ and $L_3$ are connected to a battery with negligible internal resistance, as shown in the diagram. What change occurs in the brightness of lamps $L_1$ and $L_2$ when switch $S$ is closed?
- Alamp $L_1$: brighter, lamp $L_2$: brighter
- Blamp $L_1$: brighter, lamp $L_2$: dimmer
- Clamp $L_1$: dimmer, lamp $L_2$: brighter
- Dlamp $L_1$: dimmer, lamp $L_2$: dimmer