cylinder at a point nearest the plane: The cylinder will image across the plane, producing an
equivalent two-cylinder problem, with the second one at location 5 cm below the plane. We will
take the plane as the zy plane, with the cylinder positions at x = ±5. Now b = 1 cm, h = 5
cm, and V0 = 100 V. Thus a =
√
h2 − b2 = 4.90 cm. Then K1 = [(h + a)/b]2 = 98.0, and
ρL = (4π 0V0)/ lnK1 = 2.43 nC/m. Now