Question: At what distance 'd' from the surface of a solid sphere of radius R field strength is same as at a distance from centre

At what distance 'd' from the surface of a solid sphere of radius R field strength is same as at a distance

At what distance 'd' from the surface of a solid sphere of radius R field strength is same as at a distance from centre of sphere. R 4 (1) R (3) 3R (2) 2R (4) 4R

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