An increase in which of the following factors will increase a circuit's inductive reactance?

• A. Inductance and frequency
• B. Inductance and voltage
• C. Resistance and voltage
• D. Resistance and capacitive reactance

Answer: (B)

Inductive reactance depends on how strongly an inductor resists changes in current, and it scales with both inductance and frequency. The relationship is X_L = 2π f L, so increasing either L or f increases the inductive reactance. Voltage does not appear in this formula, so changing voltage won’t change X_L. Resistance only affects the real part of impedance, not the reactive part, and capacitive reactance behaves differently (X_C = 1/(2π f C)). Therefore, the factors that increase inductive reactance are inductance and frequency.