HW problems 15. Two point charges of -2.0 C are fixed at opposite ends of a meter stick. Where on the meter
stick (if anywhere!) could (a) a free electron and (b) a free proton be placed so that they are
in electrostatic equilibrium (and won't move).
16. Redo the previous problem, this time having charges of -2.0 C and +2.0 C on either end.
17. Redo the previous problem again, this time having charges of +2.0 C and +4.0 C on either
end.