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1630 Answer Key
(b)
Figure 18.35. A vector diagram.
(c)
(d) The statement is not true. The vector diagram shows field vectors in this region with nonzero length, and the
vectors not shown have even greater lengths. The equation in part (c) shows that, when , the denominator
of the negative term is always greater than the denominator of the third term, but the numerator is the same. So the negative term always has a smaller magnitude than the third term and since the second term is positive the sum of the terms is always positive.
Chapter 19
Problems & Exercises
1
42.8
4
6
(a)
(b) A defibrillator does not cause serious burns because the skin conducts electricity well at high voltages, like those used in defibrillators. The gel used aids in the transfer of energy to the body, and the skin doesn’t absorb the energy, but rather lets it pass through to the heart.
8
(a)
(b)
9
11
(a)
(b) This voltage is very high. A 10.0 cm diameter sphere could never maintain this voltage; it would discharge. (c) An 8.00 C charge is more charge than can reasonably be accumulated on a sphere of that size.
15
(a)
(b)
17
(a) No. The electric field strength between the plates is which is lower than the breakdown strength
for air ( ).
(b) 1.7 mm
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