An aerospace sensor uses a backup capacitor to preserve state during power transitions. When the main power is disconnected, the potential difference across the capacitor drops by 15.0% of its value at the start of each minute.
If the potential difference across the capacitor is 5.50 V immediately after the main power is disconnected, what is the potential difference remaining after 4.00 minutes4.00\text{ minutes}4.00 minutes?
2.20 V2.20\text{ V}2.20 V
2.63 V2.63\text{ V}2.63 V
2.87 V2.87\text{ V}2.87 V
3.38 V3.38\text{ V}3.38 V
22 exam-style questions on OCR A A Level Physics Capacitors, covering Capacitors, Energy, and Charging and discharging capacitors. Each one has a worked solution and a mark scheme showing where the marks go.