25.3. Model: Use the charge model and the model of a conductor
as a material through which electrons move.
Solve: (a) The charge of the glass rod decreases from 12 nC to
8.0 nC. Because it is the electrons that are transferred, 4.0 nC of
electrons has bee
26.4. Model: The electric field at the point is found by superposition of the fields due to the two charges
located on the y-axis.
Visualize: The electric field due to the positive charge
at the point is away from
On the other hand, the
27.8. Model: The electric flux flows out of a closed surface around a region of space containing a net
positive charge and into a closed surface surrounding a net negative charge.
Visualize: Please refer to Figure EX27.8. Let A be the area of each of the