Author Question: A capacitor is attached across a battery and charged. Then the battery is removed leaving the ... (Read 90 times)

dejastew · **on:** Jul 28, 2018

A capacitor is attached across a battery and charged. Then the battery is removed leaving the capacitor charged. The positive lead of the capacitor is then connected to one lead of a previously uncharged identical capacitor, and then the other lead of the charged capacitor is connected to the other lead of the second capacitor. How does the energy E0 stored in the originally charged capacitor compare to the energy Ef stored in the connected capacitors?
a. E0 = 2Ef
c. E0 = 4Ef
b. E0 < Ef
d. E0 = Ef

Question 2

A rod of length L is pivoted about its left end and has a force F applied perpendicular to the other end. The force F is now removed and another force F is applied at the midpoint of the rod. If F is at an angle of 30o with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied?
a. F
c. 3F
b. 2F
d. 4F