The impedance of an ideal capacitor is Aimaginary Bzero at D

The impedance of an ideal capacitor is

A.imaginary

B.zero at DC

C.indeterminate

D.a sinusoidal function of frequency

E.constant with frequency

Solution

WE KNOW THE CAPACITOR CURRENT EQUATION.

Ic=c*(differentiation of voltage with respect to time).

IN DC SUPPLY, VOLTAGE IS CONSTANT.

SO DIFFERENTIATION OF VOLTAGE WITH RESPECT TO TIME IS ZERO.

so capacitor current is zero.

the capacitor is open circuited.

so indeterminate at DC.

OPTION:C