Four similar identical lamps are connected to a battery
as shown in the diagram. Each lamp operates at normal
brightness and the ammeter (of negligible resistance)
registers a steady current.
The filament of one of the lamps
breaks. What happens to the
ammeter reading and to the
brightness of the remaining lamps?
| Ammeter reading | Lamp brightness | |
| A | Increases | Decreases |
| B | Decreases | Remains unchanged |
| C | Remains unchanged | Remains unchanged |
| D | Increases | Increases |