An electron is in a vacuum near earth's surface and located at y = 0 m on a vertical y axis. at what value of y should a group of 23 electrons be placed such that its electrostatic force on the first electron balances the gravitational force on the first electron?

the bunch of 23 electrons must be placed on y axis at coordinate y = - 24.35 m.

Explanation:

As we know that the gravitational force on electron at y = 0 is counter-balanced by the weight of the electron

So we have

here we have

also we know that

so we will have

so the bunch of 23 electrons must be placed on y axis at coordinate y = - 24.35 m.