67. (a) Using Eq. 32-13 but noting that the capacitor is being discharged, we have 15122220||5.0A8.8 10 V/m s(8.85 10C /N m )(0.0080 m)dEidtAε−=−×⋅×⋅G. (b) Assuming a perfectly uniform field, even so near to an edge (which is consistent with the fact that fringing is neglected in §32-4), we follow part (a) of Sample Problem 32-2
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