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60. (a) Using Eq. 3237 but noting that the capacitor is being
discharged
,wehave
d

~
E

dt
=
−
i
ε
0
A
=
−
8
.
8
×
10
15
where
A
=(0
.
0080)
2
and SI units are understood.
(b) Assuming a perfectly uniform Feld, even so near to an edge (which is consistent with the fact that
fringing is neglected in
§
3210), we follow part (a) of Sample Problem 324 and relate the (absolute
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 Fall '08
 SPRUNGER
 Physics, Charge

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