Point Charges $+ 4.00 \mu \mathrm { C }$ And $+ 2.00 \mu \mathrm { C }$

Multiple Choice

Point charges $+ 4.00 \mu \mathrm { C }$ and $+ 2.00 \mu \mathrm { C }$ are placed at the opposite corners of a rectangle as shown in the figure. What is the potential difference $V _ { \mathrm { A } } - V _ { \mathrm { B } }$ ? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 8.99 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

A) $+ 22.5 \mathrm { kV }$
B) $- 203 \mathrm { kV }$
C) $+ 203 \mathrm { kV }$
D) $- 22.5 \mathrm { kV }$
E) $0.00 \mathrm { kV }$