Electric Charges: Balancing Electrostatic & Gravitational Forces

[satya_narayan]

Homework Statement

An electron is in a vacuum near the surface of the Earth. Where should a second electron be placed so that the electrostatic force it exerts on the first electron balances the gravitational force on the first electron due to Earth ?

Homework Equations

The Attempt at a Solution

 

[tiny-tim]

Welcome to PF!

An electron is in a vacuum near the surface of the Earth. Where should a second electron be placed so that the electrostatic force it exerts on the first electron balances the gravitational force on the first electron due to Earth ?

Hi satya_narayan! Welcome to PF!

Show us what you've tried, and where you're stuck, and then we'll know how to help.