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Chapter 26: Q. 1 (page 737)
What is the potential difference between and in the uniform electric field ?
is the potential difference.
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To what potential should you charge a capacitor to store of energy ?
Two flat, parallel electrodes apart are kept at potentials of. Estimate the electric field strength between them.
a. Which point in Figure EX26.5, 'A' or 'B', has a larger electric potential?
b. What is the potential difference between 'A' and 'B'?
The metal spheres are charged to . Draw this figure on your paper, then draw a plausible contour map of the potential, showing and labeling the equipotential surfaces.
A nerve cell in its resting state has a membrane potential of , meaning that the potential inside the cell is less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. This effectively makes the cell wall a charged capacitor. When the nerve cell fires, sodium ions,, flood through the cell wall to briefly switch the membrane potential to . Model the central body of a nerve cell-the soma-as a diameter sphere with a -thick cell wall whose dielectric constant is 9.0. Because a cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor. How many sodium ions enter the cell as it fires?
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