The reactive voltages, VL and VC, cancel at resonance.
Answer: Option A
Explanation:
We know that, Z = R+j (Xl-Xc) but at resonance the imaginary part is cancelled i.e. Xl = Xc. Hence Vl = I*Xl and Vc = I*Xc. Therefore at resonance Vl = Vc.
In a series RLC circuit, the larger reactance determines the net reactance of the circuit.
In a series RLC circuit, the net reactance= inductive reactance Xl-capacitive reactance Xc. therefore if any one reactances is large enough then other can be neglected and that primarily determines almost the net reactance of the circuit....
Resonance is a condition in a series RLC circuit in which the capacitive and inductive reactances are equal in magnitude.
Because at resonance XL=XC.
A certain series resonant circuit has a bandwidth of 2 kHz. If the existing coil is replaced with one having a higher value of Q, the bandwidth will
A. increase
B. remain the same
C. decrease
D. be less selective
Answer: Option C
We know, Bw = F/Q. When Q increase, the bandwidth decreases.
In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is
Answer: Option D
Vs ^2 = (Vr^2 + (Vl-Vc)^2 ), For resonance , Vl = Vc , So , Vs = Vr.
