Two $10 \phi$ Coins (Dimes) Carrying Identical Charges Are Lying $2.5 \mathrm {~m}$

Two $10 \phi$ coins (dimes) carrying identical charges are lying $2.5 \mathrm {~m}$ apart on a table. If each of these coins experiences an electrostatic force of magnitude $2.0 \mathrm {~N}$ due to the other coin, how large is the charge on each coin? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

A) $26 \mu \mathrm { C }$
B) $2.6 \mu \mathrm { C }$
C) $6.7 \mu \mathrm { C }$
D) $5.2 \mu \mathrm { C }$
E) $52 \mu \mathrm { C }$