An isolated metal sphere has a capacitance of 
and is charged to a potential of 
. Calculate the charge, in coulomb, on the sphere.
A second uncharged metal sphere is brought up to the isolated metal sphere so that they touch. The combined capacitance of the two spheres is 
. Calculate
the potential of the two spheres,
the change in the total energy stored on the spheres when they touch.
.
.
.
