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Calculate the electrostatic potential at the center of the solid sphere of radius R?

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Two particles A and B having charges q and 2q respectively are placed on a smooth table with a separation d.A third particle C is to be clamped on the table in such a way that the particles A and B remain at rest on the table under electrical forces.What should be the charges on C and where should it be clamped?

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The electric field experienced by a charge of

1 x 10^-6 C is 1.5 x 10^-3 N.Find the magnitude

of the electrical field at the position of the

charge?

also find component of resultant force and acceleration of the ball

Answer is q/2e₀L²

ans is .986 N.please explain

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Two identical balls each having charge of 2.00 x 10^-7 and mass 100 g are suspended from a common point by two insulating string each 50 cm long.The balls are held at a separation 5 cm apart and then released.Find the components of the resultant force on it along and perpendicular to the string,also find the tension in the string ,and the acceleration of ome of the balls.Answer are to be obtained only for the instant just after the release.

A rod of length L has a total charge Q distributed uniformly along its length.It is bent in the shape of a semicircle.Find the magnitude of the electric field at the centre of curvature of the semicircle.

I am not understanding , please explain in details.