a balance is constructed from a nonconducting arm of length ""l"" (you can ignore the mass of the balance arm in this problem) the arm is balanced from its center. a mass ""m"" hangs at a distance ""a"" from the left end of the rod. on the left end of the rod a charge q is attached and at the right end of the rod a charge 2q is attached. a distance ""h"" directly beneath each of these charges is a sphere of known charge q.