Question: A 1 0 Superscript negative 9 - F capacitor ( 1 nanofarad ) is charged to 1 0 0 V and then disconnected. One can

10

Superscript negative

9 -

F capacitor

(1

nanofarad

)

is charged to

100

V and then disconnected. One can model the charge leakage of the capacitor with a RC circuit with no voltage source and the resistance of the air between the capacitor plates. On a cold dry day, the resistance of the air gap is

5

times

10

Superscript

13

Upper Omega; on a humid day, the resistance is

7

times

10

Superscript

6

Upper Omega. How long will it take the capacitor voltage to dissipate to half its original value on each day?

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