Question

solve #7 please thank you

6. [2pt] A 7 00nF capacitor is discharged through a l 30 kArsistor. If the current through the resistor 110 μs after the resistor is connected to the capacitor is 3.67 mA find the initial charge stored in the capacitor. NOTE: 1 nF- 1x10"9 F Correct, computer gets: 1.12E-07 C 7. [2pt) Find the energy initially stored in the capacitor described in the previous problem. Answer: Incorrect, tries 1/5. Submit All Answers Last Answer: 1.78E-6J

Answer 1

The energy initially stored in the capacitor is

. 厂O 2

Using,  $V_{o}=\frac{Q_{o}}{C}$

We obtain

$E=\frac{1}{2}\frac{Q^{2}_{o}}{C}$

Substituting
Qo= 1.12 × 10-C
and
C = 7nF = 7 × 10-9 F

We obtain

E= 8.96 × 10-1 J