الفيزياء العامة الجزء الثاني#موقع الفيزياء.كوم

Electric Potential Difference
Solution
V B -V A =(V B -V C )+(V C -V A )
For the path AC the angle θ is 135 o ,
V
C
−V
A
= −
C
C
ο
∫ E.
dl = −∫
E cos135 dl =
A
r
r
A
E
2
C
∫
A
dl
The length of the line AC is √2 d
E
VC − VA
= ( 2d)
= Ed
2
For the path CB the work is zero and E is perpendicular to the path
therefore, V C -V A = 0
V
− V
= V
−V
B A C A
=
Ed
The Electron Volt Unit
A widely used unit of energy in atomic physics is the electron volt (eV).
ELECTRON VOLT, unit of energy, used by physicists to express the
energy of ions and subatomic particles that have been accelerated in particle
accelerators. One electron volt is equal to the amount of energy gained by
an electron traveling through an electrical potential difference of 1 V; this is
equivalent to 1.60207 x 10 –19 J. Electron volts are commonly expressed as
million electron volts (MeV) and billion electron volts (BeV or GeV).
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