In the dynamic random access memory (DRAM) of a computer, each memory cell contains a capacitor for
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(a) When fully charged, how many excess electrons are on a cell capacitor's negative plate?
(b) After charge has been placed on a cell capacitor's plate, it slowly "leaks" off at a rate of about 0.30 fC/s. How long does it take for the potential difference across this capacitor to decrease by 2.0% from its fully charged value? (Because of this leakage effect, the charge on a DRAM capacitor is "refreshed" many times per second.)
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