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Concentric spherical shells: Magnitude of electric field at point just inside outer shell

Consider two concentric spherical shells, one with radius R, and with the radius 2R. Both have the same charge Q. At a point just inside the outershell, the magnitude of the electric field is

A. 2kQ/R
C. KQ/2R
D. 2kQ/R^2

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According to Gauss law the electricflux emanated out of a closed surface be equal to the ...

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The solution clearly shows the formulas used in solving the problem.