An ideal 25.2 pf capacitor is fully charged and then disconnected from the charg

Question

An ideal 25.2 pf capacitor is fully charged and then disconnected from the charging source at time t = 0s. It is then connected to an ideal 15.6 pH inductor using perfectly conducting wires. At a certain time after the connection to the inductor is made (i.e., t > 0 s), the energy stored in the capacitor is 15.6 times10^-15 J and the energy stored in the inductor is 38.6 times 10^-15 J. What vas the energy stored in the capacitor immediately after it was disconnected from the charging source, before it was connected to the inductor (i.e., at t = 0 s)? Answer: (a)2.30times10^-14 J.(b) 5.42 times 10^-14 J. (c)7.30 times 10^-14 J. (d)9.30 times 10^-14 J. (e) 11.0 times 10^-14 J. (f)

Explanation / Answer

Initial energy stored in capacitor = total energy of the system

= energy of capacitor + energy of inductor

= 15.6e-15 + 38.6e-15 J

= 54.2*10^-15 J

= 5.42*10^-14 J answer

Option b is correct

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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