C = q/V
q = C V
i = -dq/dt = -C dV/dt
but V = i r
i = -C r di/dt
i + C r di/dt = 0
V/r + C r (1/r) dV/dt) = 0
V + r C dV/dt = 0
dV/dt = -1/rC V
dV/V = -1/rC dt
ln V = - (1/rC) t
V = Vi e^-(1/RC)t
let T = RC
V = Vi e^-t/T
if RC = 10^6 * 220*10^-6 = 220 = T
Vi = 24
V = 24 e^-t/220
if t = 100
V = 24 e^-(100/220) = 24 e^-.454
= 24*.635 = 15.2
You can do the change for new C and R and get error in V
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