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Physics Lecture Physics Lecture ResourcesResources
Prof. Mineesh GulatiHead-Physics Wing
Happy Model Hr. Sec. School, Udhampur, J&K
Website: happyphysics.com
23.1 Electric Potential Energy23.1 Electric Potential Energy
UUUUUW abbaba )(
work done by a conservative force
© 2005 Pearson Education
02
0
02
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02
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1
4
1
4
1cos cos
4
b b
a a
b b
a a
r
r r
a b rr r
r r
a b r r
qqF
r
qqW F dr dr
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qqW F dl dl
r
© 2005 Pearson Education
i i
i
r
r
q
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3
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44
Point charge and collection of charges
© 2005 Pearson Education
r
q
q
UV
00 4
1
Potential due to a point charge
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q
q
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Potential due to a collection of point charges
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Potential due to a continuous distribution of charge
© 2005 Pearson Education
23.3 Calculating Electric Potential23.3 Calculating Electric Potential
© 2005 Pearson Education
Example 23.8 A solid conducting sphere of radius R has a total charge q. Find potential everywhere, both outside and inside the sphere.
23.5 Potential Gradient23.5 Potential Gradient
x
VEx
y
VE y
z
VE z
components of in terms of
z
V
y
V
x
VkjiE ˆˆˆ
in terms of E
V
© 2005 Pearson Education
© 2005 Pearson Education
Two equivalent sets of units for electric-field magnitude are volts per meter (V/m) and newtons per coulomb (N/C). One volt is one joule per coulomb (1V-1 J/C). A useful unit of energy is the electron volt (eV), which is the energy corresponding to a particle with a charge equal to that of an electron moving through a potential difference of one volt. The conversion factor is 1 eV=1.602power-19J