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## Homework Statement

How many electrons must be removed from each two of 5.81kg copper spheres to make the electric force of repulsion between them equal to the magnitude to the gravitational attraction between them

## Homework Equations

F: Ke (q1)(q2)/r^2

## The Attempt at a Solution

( 8.99x10^9)( 9.11x10^-31)(1.67x 10^-27)/ 2 (5.81)

= 3.97x 10^ -47