A $7.0 - \mu \mathrm { C }$ Point Charge and A

Multiple Choice

A $7.0 - \mu \mathrm { C }$ point charge and a $9.0 - \mu \mathrm { C }$ point charge are initially extremely far apart. How much work does it take to bring the $7.0 - \mu C$ point charge to the point $x = 3.0 \mathrm {~mm} , y = 0.0 \mathrm {~mm}$ , and the $9.0 - \mu \mathrm { C }$ point charge to the point $x = - 3.0 \mathrm {~mm} , y = 0.0 \mathrm {~mm} ? \left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

A) $16 \mathrm {~J}$
B) $95 \mathrm {~J}$
C) $63 \mathrm {~J}$
D) $190 \mathrm {~J}$