The instantaneous voltage at three terminals marked X, Y and Z are given by VX= V0 sinωt.
VY=V0sin(ωt+2π3)and
VZ=V0sin(ωt+4π3)
An ideal voltmeter is configured to read rms value of the potential difference between its terminals. It is connected between points X and Y and then between Y and Z . The reading (s) of the voltmeter will be