# physics

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how far apatr should two electrons be if the electric force each exerts on the other is equal to the weight of an electron ? ( take the mass of an electron to be Me = 9.11 x 10-31 kg ).

• physics -

Use F=ma to find the weight of an electron, use a=9.8 m/s^2

use coulombs law

F=k(Q1Q2)/r^2

rearrange to

r^2=k(Q1Q2)/F

use k=8.99 x 10^9 N m^2/C^2

and Q1=Q2=1.60x10^-19 C

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