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Chapter 16: Q6Q (page 443)
Contrast the net charge on a conductor to the 鈥渇ree charges鈥� in the conductor.
The net charge equals the sum of all positive and negative charges in the conductor.
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How close must two electrons be if the magnitude of the electric force between them is equal to the weight of either at the Earth鈥檚 surface?
(II) When an object such as a plastic comb is charged by rubbing it with a cloth, the net charge is typically a few microcoulombs. If that charge is\({\bf{3}}{\bf{.0}}\;{\bf{\mu C}}\), by what percentage does the mass of a 9.0-g comb change during charging?
(III) Two small nonconducting spheres have a total charge of \({\bf{90}}{\bf{.0}}\;{\bf{\mu C}}\). (a) When placed 28.0 cm apart, the force each exerts on the other is 12.0 N and is repulsive. What is the charge on each? (b) What if the force were attractive?
(II) What is the electric field strength at a point in space where a proton experiences an acceleration of 2.4 million 鈥�g鈥檚鈥�?
Assume that the two opposite charges in Fig. 16鈥�32a are 12.0 cm apart. Consider the magnitude of the electric field 2.5 cm from the positive charge. On which side of this charge鈥攖op, bottom, left, or right鈥攊s the electric field the strongest? The weakest? Explain.
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