21.26 Faraday's law characterizes the voltage drop across an inductor as P V₁ = 1 di where V voltage drop (V), Z. = inductance (in henrys. IH=1V-s/A), i = current (A), and time (s). Determine the voltage drop as a function of time from the following data for an inductance of 4 H. C 0.1 0.2 0 0.16 9670 0.7 0.84 2.0 Problem 21.26. For the first point, use the second-order (O(h²)) forward finite difference. For the last point, use the second-order (O(h)) backward finite difference. For the intermediate points, use the centered finite difference of the accuracy O(h²). Note that for the point -0.3, it has unequally spaced neighbors. Use the method in Section 21.4 to calculate the derivative at this point.