suppose radius of planet is R and uniform distribution of negative charge -Q on the entire surface of planet . calculate the magnitude and direction of electric field that the planet is applied and a positive point charge Q at a distance r>R and r<R.
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Explanation: E inside is =Gm(3R²-r²)/2R³
outside is Gm/R
these are formulae so remember...
hope it helps u ............................
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