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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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(II) A large electroscope is made with 鈥渓eaves鈥� that are 78-cm-long wires with tiny 21-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26掳 angle with the vertical (Fig. 16鈥�55), what total charge Q must have been applied to the electroscope? Ignore the mass of the wires.
(II) The electric field midway between two equal but opposite point charges is\({\bf{386 N/C}}\)and the distance between the charges is 16.0 cm. What is the magnitude of the charge on each?
Estimate the net force between the CO group and the HN group shown in Fig. 16鈥�63. The C and O have charges\({\bf{ \pm 0}}{\bf{.40e}}\)and the H and N have charges\({\bf{ \pm 0}}{\bf{.20e}}\), where\({\bf{e = 1}}{\bf{.6 \times 1}}{{\bf{0}}^{{\bf{ - 19}}}}\;{\bf{C}}\). (Hint: Do not include the 鈥渋nternal鈥� forces between C and O, or between H and N.)
FIGURE 16鈥�63 Problem 50
(I) Determine the magnitude and direction of the electric force on an electron in a uniform electric field of strength \({\bf{2460}}\;{\bf{N/C}}\) that points due east.
A positively charged rod is brought close to a neutral piece of paper, which it attracts. Draw a diagram showing the separation of charge in the paper and explain why attraction occurs.
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