
The figure shows a circuit containing an electromotive force, a capacitor with a capacitance of C farads (F), and a resistor with a resistance of R ohms (Ω). The voltage drop across the capacitor is Q/C, where Q is the charge (in coulombs, C), so in this case Kirchhoff’s Law gives
But I = dQ/dt, so we have
Suppose the resistance is 5 Ω, the capacitance is 0.05 F, and a battery gives a constant voltage of 60 V.
- (a) Draw a direction held for this differential equation.
- (b) What is the limiting value of the charge?
- (c) Is there an equilibrium solution?
- (d) If the initial charge is Q(0) = 0 C, use the direction field to sketch the solution curve.
- (e) If the initial charge is Q(0) = 0 C, use Euler’s method with step size 0.1 to estimate the charge after half a second.

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Chapter 9 Solutions
Single Variable Calculus
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