الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Electric Field
3.11) Three charges are arranged in
an equilateral triangle as shown in
figure 3.17. What is the direction
of the force on +q?
+q
a
-2q
P
a
a
a
+q
a
-q a
Figure 3.19
+2q
+Q a -Q
Figure 3.17
3.12) In figure 3.18 locate the point at
which the electric field is zero and
also the point at which the electric
potential is zero. Take q=1µC and
a=50cm.
-5q +2q
50cm
Figure 3.18
3.13) What is E in magnitude and
direction at the center of the square
shown in figure 3.19? Assume that
q=1µC and a=5cm.
3.14) Two point charges are a
distance d apart (Figure 3.20). Plot
E(x), assuming x=0 at the left-hand
charge. Consider both positive and
negative values of x. Plot E as
positive if E points to the right and
negative if E points to the left.
Assume q 1 =+1.0×10 -6 C,
q 2 =+3.0×10 -6 C, and d=10cm.
d
q 1
q 2
P
x
Figure 3.20
3.15) Calculate E (direction and
magnitude) at point P in Figure
3.21.
+q
a
P
+2q
a
+q
Figure 3.21
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