Physics WAEC

In a series R-L-C circuit, R = 10Ω, Xc= 4Ω and XL = 9Ω. The impedance of the circuit is?

A. 4.1Ω
B. 5.0Ω
C. 10.8Ω
D. 11.2Ω

Correct Answer: Option D

Explanation

The impedance for a RLC circuit is

Z=√R²+(XL−XC

= √10²+(9−4)²

= √125

= 11.18Ω ≊ 11.2Ω

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