The tuning circuit of a radius is formed by a 400 ohms resistance , a coil of 0.

Question

The tuning circuit of a radius is formed by a 400 ohms resistance, a coil of 0.5 mH, and a variable capacitor. If the capacitor is set to 72 pF. Calculate the total impedance of the circuit if the source frequency is set to the circuit's resonant frequency is 0.84 MHz

a)40 ohms

b)4 ohms

c)400 ohms

d)4000 ohms

The tuning circuit of a radius is formed by a 400  Ohms  resistance, a coil of 0.5 mH, and a variable capacitor. If the capacitor is set to 72 pF. Calculate the total impedance of the circuit if the source frequency is set to the circuit's resonant frequency is 0.84 MHz 40 Ohms 4 Ohms 400 Ohms 4000 Ohms

Explanation / Answer

XL =2pifL =2pi*0.84*10^6 =2639 ohms

Xc=1/2pifC =1/2pi*0.84*10^6*72*10^-12

Xc =2631.53 ohms

Z=sqrt[R^2+(XL-Xc)^2]

Z=400 ohms

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