Write the expression for discharging of capacitor.
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q=ϵC(1−eCR−t) where q is the charge on the capacitor at time t,CR is called the time constant, ϵ is the emf of the battery. Discharging: If the plates of a charged capacitor are connected through a conducting wire, the capacitor gets discharged.
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Q'=EC(1-e^-t/RC)
Derivation
using Kirchhoff law we can write
q/C+Ri-e=0
Rdq/dt=EC-q/EC
from here
Q'=EC(1-e^-t/RC)
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