Chapter 23: Problem 21
A capacitor's plates hold \(1.3 \mu \mathrm{C}\) when charged to \(60 \mathrm{V}\). What's its capacitance?
Chapter 23: Problem 21
A capacitor's plates hold \(1.3 \mu \mathrm{C}\) when charged to \(60 \mathrm{V}\). What's its capacitance?
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Get started for freeYour company is still stuck with those 2 - \(\mu\) F capacitors from Problem 50. They turn out to be so cheap that their capacitances are all too low, ranging from \(1.7 \mu \mathrm{F}\) to \(1.9 \mu \mathrm{F}\). A colleague suggests you put variable "trimmer" capacitors in parallel with the cheap capacitors and adjust the combination to precisely \(2.00 \mu \mathrm{F} .\) The available trimmers have variable capacitance from \(25 \mathrm{nF}\) to \(350 \mathrm{nF}\). Will they work?
A capacitor consists of square conducting plates \(25 \mathrm{cm}\) on a side and \(5.0 \mathrm{mm}\) apart, carrying charges \(\pm 1.1 \mu \mathrm{C}\). Find (a) the electric field, (b) the potential difference between the plates, and (c) the stored energy.
A sphere of radius \(R\) contains charge \(Q\) spread uniformly throughout its volume. Find an expression for the electrostatic energy contained within the sphere itself. (Hint: Consult Example 21.1.)
The potential difference across a cell membrane is \(65 \mathrm{mV}\). On the outside are \(1.5 \times 10^{6}\) singly ionized potassium atoms. Assuming an equal negative charge on the inside, find the membrane's capacitance.
Show that the units of \(\epsilon_{0}\) may be written as \(\mathrm{F} / \mathrm{m}\).
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