A 100 $\Omega$ resistance and a capacitor of 100 $\Omega$ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is

1. 2.2 A             

2. 11A

3. 4.4A               

4. 11$\sqrt{2}$A

A small-signal voltage V(t)=V_o sinωt is applied across an ideal capacitor C 

1. over a full cycle, the capacitor C does not consume any energy from the voltage source

2. current I(t) is in phase with voltage V(t)

3. current I(t) leads voltage V(t) by 180°

4. current I(t) lags voltage V(t) by 90°

Which of the following combinations should be selected for better tuning of an \(LCR\) circuit used for communication?
1. \(R=20~\Omega ,~L=1.5~\text{H},~C=35~\mu \text{F}\)
2. \(R=25~\Omega ,~L=2.5~\text{H},~C=45~\mu \text{F}\)
3. \(R=15~\Omega ,~L=3.5~\text{H},~C=30~\mu \text{F}\)
4. \(R=25~\Omega ,~L=1.5~\text{H},~C=45~\mu \text{F}\)