A 3.40- ? F capacitor is charged by a 12.0- V battery. It is disconnected from t

Question

A 3.40-?F capacitor is charged by a 12.0-V battery. It is disconnected from the battery and then connected to an uncharged 4.50-?F capacitor (see (Figure 1) ).

A 3.40-?F capacitor is charged by a 12.0-V battery. It is disconnected from the battery and then connected to an uncharged 4.50-?F capacitor (see (Figure 1) ). Determine the total stored energy before the two capacitors are connected. Express your answer using three significant figures and include the appropriate units. Which i got 2.45*10^-4 J Determine the total stored energy after they are connected. Express your answer using three significant figures and include the appropriate units. PE final = What is the change in energy? Express your answer using three significant figures and include the appropriate units.

Explanation / Answer

b. charge Q1 across C1 , Q1 = C1V = 3.4uF * 12 = 40.8 uC

total energy U = Q^2/2C

= 40.8^2*10^-12/(2*4.5*10^-6)

= 1.84 *10^-4 J

c. change in energy U = 2.45-1.84 = 6.1 *10^-5 J

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.