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Chapter 19: Q13CQ (page 694)
Can different equipotential lines cross? Explain.
No, the different equipotential lines cannot cross each other.
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In open heart surgery, a much smaller amount of energy will defibrillate the heart.
(a) What voltage is applied to the \(8.00{\rm{ }}\mu F\)capacitor of a heart defibrillator that stores \(40.0{\rm{ }}J\) of energy?
(b) Find the amount of stored charge.
Question: Unreasonable Results
(a) On a particular day, it takes\(9.60 \times {10^3}\;J\)of electric energy to start a truck's engine. Calculate the capacitance of a capacitor that could store that amount of energy at\(12.0\;V\).
(b) What is unreasonable about this result?
(c) Which assumptions are responsible?
An electron is to be accelerated in a uniform electric field having a strength of \({\bf{2}}.{\bf{00}} \times {\bf{1}}{{\bf{0}}^6}{\rm{ }}{\bf{V}}/{\bf{m}}\). (a) What energy in \(keV\) is given to the electron if it is accelerated through \({\bf{0}}.{\bf{400}}{\rm{ }}{\bf{m}}\)? (b) Over what distance would it have to be accelerated to increase its energy by \({\bf{50}}.{\bf{0}}{\rm{ }}{\bf{GeV}}\)?
Integrated Concepts
Singly charged gas ions are accelerated from rest through a voltage of \(13.0{\rm{ }}V\). At what temperature will the average kinetic energy of gas molecules be the same as that given these ions?
How does the polar character of water molecules help to explain water's relatively large dielectric constant? (Figure 19.19)
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