الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
5.9) Consider a point charge with
q=1.5×10 -6 C. What is the radius of
an equipotential surface having a
potential of 30V?
5.10) Two large parallel conducting
plates are 10cm apart and carry
equal and opposite charges on their
facing surfaces. An electron placed
midway between the two plates
experiences a force of 1.6×10 15 N.
What is the potential difference
between the plates?
5.11) A point charge has q=1.0×10 -
6 C. Consider point A which is 2m
distance and point B which is 1m
distance as shown in the figure
5.21(a). (a) What is the potential
difference V A -V B ? (b) Repeat if
points A and B are located
differently as shown in figure
5.21(b).
B
q
A
5.12) In figure 5.22 prove that the
work required to put four charges
together on the corner of a square
of radius a is given by (w=-
0.21q 2 / εο
a).
+q
a
- q a
Figure 5.22
- q
+q
5.13) Two charges q=+2×10 -6 C are
fixed in space a distance d=2cm)
apart, as shown in figure 5.23 (a)
What is the electric potential at
point C? (b) You bring a third
charge q=2.0×10 -6 C very slowly
from infinity to C. How much
work must you do? (c) What is the
potential energy U of the
configuration when the third charge
is in place?
Figure 5.21(a)
C
B
1/2d
q
A
q
1/2d 1/2d
O
q
Figure 5.21(b)
Figure 5.23
Dr. Hazem Falah Sakeek