1. The problem statement, all variables and given/known data 1) How many electrons make up a charhe of 1 mu C? 2)What is the magnitude of the force a 10-mu C charge exerts on a 3.0-mC charge 2.0 m away? (1 muC=10^+/-6C , 1 mc=10^+/-3C) 2. Relevant equations FE=(kQQ)/d^2 3. The attempt at a solution 1) (10E-6 C)/(1.6E-19) I got 6.2E13 but the book says a micro columb is 1.0E-6, and the other book I have says it's 10E-6. Which is it? 2)FE=[(9.0E9)(1E-4)(0.03)]/4 =6750 N The book says the 10-mu C charge is 10E-6 and the 3.0-mC charge is 3.0E-3. I'm confused.