Question

How much repulsion is between two electrons placed 1cm away from each other? Given that mass of an electronis9;1kg

Answer 1

Answer:

Explanation:

How far should two electrons be placed to show that the force of repulsion is equal to the weight of the electron?

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well one knows the force of repulsion between two charges say q1 and q2 placed at a distance say r m.

the force is by coulomb’s law

F = k. (q1.q2 )/r^2

you want that this repulsive force should be equal to mass of electron

me.g

wt. of the electron = me.g = k. (q1.q2 )/r^2

so the distance r = SQRT { k. (q1.q2 )/ (me.g) }

here q1=q2= electronic charge = 1.6.10^-19 c

me= mass of electron= 9.1 .10^-31 kg

g= 10m/s^2 and

K = 1/(4pi epsilon_0) = 9.10^9

so approx. the r= 5.33 m

so electron is very light particle.