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A typical capacitor in a memory cell have a capacitance of (8 x 10-12 F )....

A typical capacitor in a memory cell have a capacitance of (8 x 10-12 F ). If the voltage across the capacitor is 200 milivolt, determine the number of electrons that move on the capacitor to charge it. Show your calculation.

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Answer #1

Given that:

Capacitance, C = 8 x 10-12 F

Voltage, V = 200 mV = 0.2 V

Therefore, Charge on capacitor (Q) is given by:

Q = CV

Q = (8 x 10-12 F) x (0.2 V)

:: Q = 1.6 x 10-12 C

We know that, Charge of a single electron, Qe = 1.6 x 10-19 C

  • Therefore, No.of electrons required to build up the charge in the capacitor is given by:

Q 1.6 x 10-12 1.6 x 10-19 C

win = 1 x 107 electrons

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