Charging a capacitor A capacitor is a device that stores electrical charge. The charge on a capacitor accumulates according to the function Q(t) = a(l − e−t/c), where t is measured in seconds, and a and c > 0 are physical constants. The steady-state charge is the value that Q(t) approaches as t becomes large.
a. Graph the charge function for t ≥ 0 using a = 1 and c = 10. Find a graphing window that shows the full range of the function.
b. Vary the value of a while holding c fixed. Describe the effect on the curve. How does the steady−state charge vary with a?
c. Vary the value of c white holding a fixed. Describe the effect on the curve. How does the steady-state charge vary with c?
d. Find a formula that gives the steady-state charge in terms of a and c.
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