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Chapter 17: Q8Q (page 473)
Can two equipotential lines cross? Explain.
No, two equipotential lines can not be crossed with each other as a point can never have two potential values.
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Question: (I) A cardiac defibrillator is used to shock a heart that is beating erratically. A capacitor in this device is charged to 5.0 kV and stores 1200 J of energy. What is its capacitance?
In the DRAM computer chip of Problem 94, suppose the two parallel plates of one cell’s 35-fF capacitor are separated by a 2.0-nm-thick insulating material with dielectric constant K= 25.
(a) Determine the area A\(\left( {{\bf{\mu }}{{\bf{m}}^{\bf{2}}}} \right)\)of the cell capacitor’s plates.
(b) If the plate area A accounts for half of the area of each cell, estimate how many megabytes of memory can be placed on a\({\bf{3}}\;{\bf{c}}{{\bf{m}}^{\bf{2}}}\)silicon wafer.\(\left( {{\bf{1}}\;{\bf{byte = 8}}\;{\bf{bits}}{\bf{.}}} \right)\)
Question:(III) Electrons are accelerated by 6.0 kV in a CRT. The screen is 30 cm wide and is 34 cm from the 2.6-cm-long deflection plates. Over what range must the horizontally deflecting electric field vary to sweep the beam fully across the screen?
Can a particle ever move from a region of low electric potential to one of high potential and yet have its electric potential energy decrease? Explain.
Question: A \({\bf{3}}{\bf{.4}}\;{\bf{\mu C}}\) and a \({\bf{ - 2}}{\bf{.6}}\;{\bf{\mu C}}\) charge are placed 2.5 cm apart. At what points along the line joining them is (a) the electric field zero, and (b) the electric potential zero?
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