الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Lectures in General Physics
Example 5.1
Derive the potential difference between points A and B in uniform
electric field using the general case.
Solution
V
B
−V
A
= −
B
B
ο
∫ E.
dl = −∫
E cos180 dl = ∫
A
r
r
A
B
A
Edl
(5.7)
E is uniform (constant) and the integration over the path A to B is d,
therefore
B
V
B
−VA
= E∫ dl = Ed
(5.8)
A
Example 5.2
In figure 5.6 the test charge moved
from A to B along the path shown.
Calculate the potential difference
between A and B.
B
Dd
F
Ddl
Oq o
Oq o E
Ddl
Oq o
Oq E
o
F
C
A
E
Figure 5.6
Dr. Hazem Falah Sakeek