Question

When a circuit consist of capacitor and a resistor in series with voltage source and voltage across the resistor is zero then the capacitor is?

Answer 1

in any cicuit if the voltage drop across resistor is zero then the circuit is purely inductive (if it consist inductor ) and purely capacitive (if it consist capacitor) .

in your question your circuit is consist in series with a resistor and capacitor and resistor voltage is zero so the circuit behaves like pure Capacitve circuit.

i hope this answer helps you.