Extra exam question E5C06

WhyThe impedance 50 - j25 ohms represents 50 ohms of resistance in series with 25 ohms of capacitive reactance. In the impedance 50 - j25 ohms, the real part, 50 ohms, is the resistance, and the negative imaginary part, 25 ohms, represents capacitive reactance, since a negative j term is the rectangular-notation convention for capacitive reactance, answer B. A positive j value would indicate inductive reactance instead, and swapping which figure is resistance versus reactance doesn't match how the real and imaginary parts are read.