Two $+ 6.0 - \mu \mathrm { C }$ Charges Are Placed at Two of the Vertices of an Are

Multiple Choice

Two $+ 6.0 - \mu \mathrm { C }$ charges are placed at two of the vertices of an equilateral triangle having sides $2.0 \mathrm {~m}$ Iong. What is the electric potential at the third vertex, relative to infinity, due to these charges? $( k =$ $1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 }$ )

A) $108 \mathrm {~V}$
B) $90 \mathrm { kV }$
C) $54 \mathrm { kV }$
D) $0 \mathrm {~V}$
E) $27 \mathrm { kV }$