In the circuit shown below, a three-phase star-connected unbalanced load is connected to a balanced three-phase supply of 100√3 V with phase sequence ABC. The star connected load has ZA = 10 Ω and ZB = 20∠60° Ω. The value of ZC in Ω, for which the voltage difference across the nodes n and n′ is zero, is
1
20∠−30°
2
20∠30°
3
20∠−60°
4
20∠60°