Calculate the surface charge density σa on the inner metal sphere at a = 4 cm.

In order to include the effects of a physical battery, we could add a resistor Rbattery.  This resistor should be placed

If the position of sphere 1 is at x = 0 and the position of sphere 2 is at x = d, what region along the x-axis contains a point (outside the spheres) where the electric field is zero? (see figure part d)

A third charge Q3 = 5 μC is placed at point P.  What is the total work done by the electric field when these three charges are moved from infinitely far apart to this final configuration?

If r = 5 cm, what is λ?

After the switch has been closed for a very long time, it is then re-opened.  If the value of the charge at the instant the switch is reopened is Q0, what is the charge on the capacitors after a time t = 90 μs?

Calculate the magnitude of the electric field E at a radius of 6 cm from the origin.

Which of the following best characterizes electrical insulators?

What is the magnitude of the electric field due to the two charges at point P, a distance 0.425 m above charge q2?

Determine the energy U2 stored in the capacitor C2 at full charge.