A parallel plate capacitor has a plate of length l, width w, & separation of plates is d. If it is connected to a battery of emf V, A dielectric slab of the same thickness d & of dielectric constant K = 4 is inserted between the plates of the capacitor. At what length of the slab inside states, will the energy stored in the capacitor be two times its initial energy stored?
A 60 pF of capacitor is fully charged by a 20 V supply. It is then disconnected from the supply and is connected to another uncharged 60 pF capacitor in parallel. The electrostatic energy that is lost in this process by the time the charge is redistributed between them is (in nJ)
The effective capacitance of a parallel combination of two capacitors C1 and C2 is . When these capacitors are individually connected to a voltage source of
, the energy stored in the capacitor C2 is
times that of C1. If these capacitors are connected in series, their effective capacitance will be (
):