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In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the capacitive reactance in the circuit.

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In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the capacitive reactance in the circuit.

(a) 316 ohm

(b) 195 ohm

(c) 124 ohm

(d) 212 ohm

The question was posed to me during an online interview.

The above asked question is from Kirchhoff’s Laws and Network Solution topic in portion Network Theorems Applied to AC Networks of Basic Electrical Engineering

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Correct answer is (d) 212 ohm

The best explanation: XC=1/(2πfC)   f=50Hz and C=15 μF

XC=1/(2π*50*15*10^-6) =  212.21 ohm.

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