The total amount of charge that has entered a wire at time t is given by the expression Q = (20 C)(1 - e^{-t/(2.0 s)}), where t is in seconds and t ≥ 0.
a. Find an expression for the current in the wire at time t.
b. What is the maximum value of the current?
c. Graph I versus t for the interval 0 ≤ t ≤ 10 s.