1. A metal ball has -9 Coulomb of charge. If it receives 0.50 * 10^20 number of electrons, what will be the resultants charge of the ball?
2. 2 equal charges are seperated by 33 mm and experiences a repulsion force of 9 Newton. Calculate the amount of each charge in micro Coulombs.
3. 2 equal charges, 147 micro Coulombs each, experiences an attraction force of 147 Newton. Calculate the distance between the charges in mm.
4. Add 6 micro Coulombs and 4,743 nano Coulombs and get the results in nano Couloms unit.