(HINT: May want to find velocity of the moon- check out old M.R.’s for circular motion and velocity) 5.6x10 13 C answers may vary depending on rounding. How many electrons is this? 3.5x10 32 e’s *4) Three charges are fixed on the ends of insulating rods as show in the diagram. Charge A has a charge of +6µC (where µ means “micro” and mathematically is x10-6 ) charge B has a charge of -4µC, and charge C has a charge of +8µC. a) Find the net force acting on C . 9.74N @ 38.16º 5) A +5µC charge is placed 2m from a +7µC charge. Where should you place a +3µC charge so the net force acting on the 3µC charge is zero? 0.916m 6) A +4µC charge is placed 3m from a -8µC charge. Where should you place a -2µC charge so the net force acting on the -2µC charge is zero? 7.24m 1) Two metal spheres are hanging on 0.5m long, non-conducting strings. Each sphere has a charge of 5µC. The metal spheres are separated by 0.15 m. The angle made by the strings and where they are connected is 2º. What is the mass of each ball? Yes, you must include gravity for this one. 29.22 kg *2) A block with a mass of 1.5kg and charge 4x10-5 C is placed as close as possible to a fixed charge of 6x10-6 C. If the closest the block can be to the fixed charge is 0.6 m
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