A cell culture monitoring system uses a $μF15\ \mu\text{F}$ capacitor charged to a potential difference of 12.0 V as a backup power source. The initial charge stored is $Q_0\,$ and the initial energy stored is $E_0$ . During a power interruption, the capacitor discharges through a precision $kΩ400\ \text{k}\Omega$ resistor. The time constant of this discharge circuit is $T$ . Which statement is correct?

The time constant $T$ is $ms6.0\ \text{ms}$ .

The initial charge $Q_0$ is $μC18\ \mu\text{C}$ .

After a time $3 T$ , the energy stored in the capacitor is $E_0 e^{-3}$ .

After a time $T$ , the potential difference across the capacitor is $V4.4\ \text{V}$ .

The time constant $T$ is $ms6.0\ \text{ms}$ .

The initial charge $Q_0$ is $μC18\ \mu\text{C}$ .

After a time $3 T$ , the energy stored in the capacitor is $E_0 e^{-3}$ .

After a time $T$ , the potential difference across the capacitor is $V4.4\ \text{V}$ .

Fields and their consequences (A-level only)

Question 55

Markscheme

Fields and their consequences (A-level only)

Question 55

Markscheme

Fields and their consequences (A-level only)

Question 55

Fields and their consequences (A-level only) Questions

Fields and their consequences (A-level only)

Question 55

Fields and their consequences (A-level only) Questions