Find out impedance of given circuit.

AC voltage source (V, omega) is applied across a parallel LC circuit as shown in figure. Find the impedance of the circuit and phase of current.

An alternating current of frequency omega=314s^(-1) is fed to a circuit consisting of a capacitor of capacitance C=73 muF and an active resistance R=100 Omega connected in parallel. Find the impedance of the circuit.

The impedance of the given circuit will be -

At very high frequencies ,the effective impedence of the given circuit will be _______ Omega .

Explain impedance of an ac circuit.