Chapter 25: Q. 8 (page 708)
Rank in order, from largest to smallest, the electric potentials
The order in electric potentials from largest to smallest,
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What is the speed of an electron that has been accelerated from rest through a potential difference of
What is the electric potential energy of the group of charges in
FIGURE EX25.7?
Living cells โpumpโ singly ionized sodium ions, Na+, from the inside of the cell to the outside to maintain a membrane potential โVmembrane = Vin - Vout = - 70 mV. It is called pumping because work must be done to move a positive ion from the negative inside of the cell to the positive outside, and it must go on continuously because sodium ions โleakโ back through the cell wall by diffusion. a. How much work must be done to move one sodium ion from the inside of the cell to the outside? b. At rest, the human body uses energy at the rate of approximately 100 W to maintain basic metabolic functions. It has been estimated that 20% of this energy is used to operate the sodium pumps of the body. Estimateโto one significant figureโthe number of sodium ions pumped per second.
FIGURE P25.71 shows a thin rod with charge Q that has been bent into a semicircle of radius R. Find an expression for the electric potential at the center.
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