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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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(a) The electric field near the Earth鈥檚 surface has magnitude of about 150 N/C. What is the acceleration experienced by an electron near the surface of the Earth? (b) What about a proton? (c) Calculate the ratio of each acceleration to \({\bf{g = 9}}{\bf{.8}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\).
The balloon in Fig. 16鈥�48 was rubbed on a student鈥檚 hair. Explain why the water drip curves instead of falling vertically.
Given two point charges, Q and 2Q, a distance \(l\) apart, is there a point along the straight line that passes through them where \(E = 0\) when their signs are (a) opposite, (b) the same? If yes, state roughly where this point will be.
(II) What is the total charge of all the electrons in a 12-kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197 u.)
(I) A downward electric force of 6.4 N is exerted on a\( - {\bf{7}}{\bf{.3}}{\rm{ }}\mu {\bf{C}}\)charge. Find the magnitude and direction of the electric field at the position of this charge.
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