Questions
Two identical capacitors, have the same capacitance C. One of them is charged to potential V1 and the other to V2. The negative ends of the capacitors are connected together. When the positive ends are also connected, the decrease in energy of the combined system is
detailed solution
Correct option is C
Common potential V=CV1+CV2C+C=V1+V22 Loss =12CV12+12CV22−12(C+C)V2 =14CV1−V22Talk to our academic expert!
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On plate of a capacitor is connected to a spring as shown in fig. Area of both the plates is A. In steady state, separation between the plates is 0 8 d (spring was in its natural length and the distance between the plates was d when the capacitor was uncharged). The force constant of the spring is approximately
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