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Unformatted text preview: 56. Since the ﬁelds involved are uniform, the precise location of P is not relevant; what is important is it is
above the three sheets, with the positively charged sheets contributing upward ﬁelds and the negatively
charged sheet contributing a downward ﬁeld, which conveniently conforms to usual conventions (of
upward as positive and downward as negative). The net ﬁeld is directed upward, and (from Eq. 24-13)
is magnitude is
1.0 × 10−6
= 5.6 × 104 N/C .
2 × 8.85 × 10−12 ...
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