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Two small spheres each of mass 10 mg are suspended from a point by threads 0.5m long. They are equally charged and repel each other to a distance of 0.20m. The charge on each of the sphere is a21×10−8C. the value of ‘a’ will be —— [given g = 10ms-2]

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answer is 20.

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Detailed Solution

At equilibrium,F=mgtan⁡θ⇒9×109×q20.04=10×10−3×10−3×10×124⇒q=0.95×10−8C=2021×10−8C So, a=20

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Two small spheres each of mass 10 mg are suspended from a point by threads 0.5m long. They are equally charged and repel each other to a distance of 0.20m. The charge on each of the sphere is a21×10−8C. the value of ‘a’ will be —— [given g = 10ms-2]