EqzzR=+40223 2πεch/where qis the charge on the ring and Ris the radius of the ring (see Eq. 22-16). For qpositive, the field points upward at points above the ring and downward at points below the ring. We take the positive direction to be upward. Then, the force acting on an electron on the axis is FeqzzR= −+40223 2πεch/.For small amplitude oscillations zR<<and zcan be neglected in the denominator. Thus, FeqzR= −403πε.The force is a restoring force: it pulls the electron toward the equilibrium point
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