77. (a) With f understood to be in Hertz, the capacitive reactance is X C = £ (2 π )(45 × 10 − 6 F) f ¤ − 1 . (b) The resistance, reactance and impedance are plotted over the range 10 ≤ f ≤ 70 Hz. The horizontal line is R , and the curve that crosses that line is X C . SI units are understood.
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