04:07
Physics 102 Electricity and Magnetism
Figure $21-37$ shows four identical conducting spheres that are actually well separated from one another.
Sphere $W$ (with an initial charge of
zero) is touched to sphere $A$ and then they are separated. Next, sphere $W$ is
touched to sphere $B$ (with an initia lcharge of $-32 e$ and then they are separated. Finally, sphere $W$ is
touched to sphere $C($ with an initial charge of $+48 e),$ and then they
are separated. The final charge on sphere $W$ is $+18 e .$ What was the
initial charge on sphere $A$ ?