Correct option is C
Given Condition:
Xc=0: This implies that there is no capacitive reactance.
In such a case, the circuit behaves as a
pure resistive circuit, and the impedance is entirely determined by the resistance R.
Vector Representation in the RC Plane:
In an RC circuit, the impedance vector is represented in the complex plane with the resistance (R) on the real axis and the capacitive reactance (Xc) on the negative imaginary axis.
Since Xc=0, the vector lies entirely on the positive real axis.
Effect of Increasing Resistance R:
As R increases, the length of the vector (magnitude of the impedance) increases.
Since the vector lies on the real axis, it
remains pointing straight toward the right (positive real axis) regardless of the value of R.
Thus, the vector in the RC plane will
always point straight toward the right as R increases.
