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Positive charge Q is distributed uniformly throughout an insulating sphere of radius R, centered
at the origin. A particle with positive charge Q is placed at x = 2R on the x axis. The
magnitude of the electric field at x = R/2 on the x axis is:
E. none of these
A copper wire of diameter d is immersed in an oil of density rho not. There is a uniform electric field E directed vertically upwards such that the copper ball remains just suspended in the oil. Density of copper is rho c. The charge on the ball is ?
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