- #1
And123
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Homework Statement
Differentiate V0 - iR - q/C = 0 to prove that di/dt = -i/RC.
Homework Equations
V0 - iR - q/C = 0
^ derived from previous question for a circuit that had one battery with emf V0, a resistor of resistance R and a capacitor of capacitance C (all in series).
di/dt = -i/RC
The Attempt at a Solution
V0 - iR - q/C = 0
V0 - (dq/dt)R - q/C = 0
V0C - (dq/dt)RC - q = 0
(dq/dt)RC = V0C - q
d/dt((dq/dt)RC) = d/dt(V0C - q)
RC(d/dt(dq/dt) = -dq/dt
RC(di/dt) = -i
di/dt = -i/RC
^ not sure if my maths makes sense (not very good at doing dif/integration when there are multiple variables). I did get the "answer" (which is easy, since its given), but obviously the method's what matters.
Thanks a lot!