Coulomb's Law Packet Coulomb's Law of Electrostatics states that ...

Sample Problems:Given:Q1= 6.4 x 10 -7 CQ2=7.3 x 10 -7 CFelectric 0.3 Nk 9 10 9 Nm 2 /C 2Unknown: r ?Equation:Solve for r:and thenSubstitute the values and solve:=0.12 m2. Suppose you place equal but opposite amounts of charge at the Earth’s North and South Poles. How much charge isat each pole if the magnitude of the electric force compressing Earth is 5.17 10 5 N? Earth’s diameter is 1.27 10 7 m.Given:Felectric 5.17 10 5 Nr 1.27 10 7 mk 9 10 9 Nm 2 /C 2Unknown: q ?Equation:Solve for Q since they are equaland then rearrangeand finallySubstitute the values into the equation(s) and solve:Even though the force is attractive (-) we don’t put the minus sign into the equation because we really don’t know what direction theforce is.