Answer to Question 3

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(a) The y-axis intercept represents the start voltage.

(b)  The y-axis intercept is at 1.79.  ln-1 (1.79) = e1.79 = 5.99 V = 6.0 V

(c) Calculate the gradient:

     Gradient = -1/t = Dy Dx = (1.79 - 0) (0 s - 39.3 s) =  -0.0455 s-1

      -t =  (-0.0455 s-1)-1

         t = 21.95 s = 22 s

 (d) Q = CV = 2.2 10-3 F 6.0 V = 0.013 C