A Square Is $1.0 \mathrm {~m}$ On a Side Point Charges Of \mathrm

Multiple Choice

A square is $1.0 \mathrm {~m}$ on a side. Point charges of $+ 4.0 \mu \mathrm { C }$ are placed in two diagonally opposite corners. In the other two corners are placed charges of $+ 3.0 \mu \mathrm { C }$ and $- 3.0 \mu \mathrm { C }$ . What is the potential (relative to infinity) at the midpoint of the square? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

A) $1.0 \times 10 ^ { 4 } \mathrm {~V}$
B) infinite
C) $1.0 \times 10 ^ { 6 } \mathrm {~V}$
D) $1.0 \times 10 ^ { 5 } \mathrm {~V}$
E) $0 \mathrm {~V}$