Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.20 m. The charge on each of the sphere is $\frac{a}{{21}} \times {10^{ - 8}}C.$ The value of $a$ will be ……………………
[Given, ${\rm{g }} = {\rm{ 10 m}}{{\rm{s}}^{ - 2}}$ ]
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