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If
d
= 0.20 m (which is less than the magnitude of
r
found above), then neither of the
points (
x
≈
± 0.691 m) is in the “forbidden region” between the particle and the sheet.
Thus, both values are allowed. Thus, we have
(a)
x
= 0.691 m on the positive axis, and
(b)
x
=
−
0.691 m on the negative axis.
(c) If, however,
d
= 0.80 m (greater than the magnitude of
r
found above), then one of the
points (
x
≈
−
0.691 m) is in the “forbidden region” between the particle and the sheet and
is disallowed.
In this part, the fields cancel only at the point
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 Spring '08
 Any
 Physics, Charge

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