Charging the Sphere: Charge the plastic block by rubbing with fur. Place the
metal plate atop the block and touch the plate to ground it, allowing it to become charged. Pick up
the plate and touch it to the metal sphere, making sure to hold both objects by their wooden
Charging the Outside: Touch the sphere to the outside of the coffee can
(ice pail). Notice that the electroscope has now become charged. Discharge the electroscope by
touching it with your finger. Touch the can with the sphere again, and see that the leaves of the
electroscope become charged.
Charging from the Inside: Discharge the electroscope, recharge the sphere, and lower the
sphere to the bottom of the can. Lift it out, being careful not to let it touch the sides of the
can. Discharge the electroscope and touch the sphere to the outside of the can. Note that the
electroscope remains uncharged.