Question

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第七題和第九題求解謝謝～～
（算不出來😅，然後第9題的小d是指哪一段😅😅）
答案
7.(a)3cm／(b)4.09×10^-24N
9.(a)1.44cm／ (b)less than

FIGURE 21.13 Problems 5, 6, and 7.
7M In Fig. 21.13, particles 1 and 2 are fixed in place on an x
axis, at a separation of L = 12.0 cm. Their charges are q₁ = +e
and q2=-27e. Particle 3 with charge q3=+4e is to be placed
on the line between particles 1 and 2, so that they produce a net
electrostatic force F3, net on it. (a) At what coordinate should
particle 3 be placed to minimize the magnitude of that force?
(b) What is that minimum magnitude?
y
1
L
2
X
FIGURE 21.13 Problems 5, 6, and 7.
=
9H Figure 21.14 shows an arrangement of four charged par-
ticles, with angle 0-30.0° and distance d=1.50 cm. Particle 2
has charge q: +8.00 x 10-19 C; particles 3 and 4 have charges
93-94 -1.60 x 10-19 C. (a) What is distance D between the
origin and particle 2 if the net electrostatic force on particle 1
due to the other particles is zero? (b) If particles 3 and 4 were
moved closer to the x axis but maintained their symmetry about
that axis, would the required value of D be greater than, less
than, or the same as in part (a)?
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FIGURE 21.14 Problem 9.
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物理