An electric kiln with a metal casing is connected to a 230 V RMS mains supply. The live wire inside the kiln has a resistance of 0.35 Ω up to the point of a fault, and the earth wire has a resistance of 0.15 Ω.
A fault develops, causing the live wire to make direct contact with the metal casing as shown in the diagram below:
What is the RMS voltage VcasingV_{\text{casing}}Vcasing of the metal casing relative to the ground during the short interval before the fuse blows?
161 V161\text{ V}161 V
69 V69\text{ V}69 V
98 V98\text{ V}98 V
230 V230\text{ V}230 V