How electric fields workI how that connects to potential energy (v)
↑
·
a charge a in an electric field E feels a Force
F =
gE
pos charge same direction as E
·
:
neg charge :
opposite direction .
W =
/F -
d5 = -
Au
·
work done by the electric field neg-
:
change in potential energy
Case I : Charge moves with the electric field/same direction
WTO
W= -
AU
AU < 8
the electric field is
doing the work , charge is
"falling naturally"
·
potential energy decreases
Uf Vi
charge moving against the electric field -
need an external Force
<O
U >O
·
electric field is fighting the motion
Up > Vi
·
W= F d .
↳
·
same direction WO
Opposite direction -W < o
the electric field is whats doing this work
Electric Potential energy between two point charges
there is a source charge a in the center
you are
moving another
charge go from point ab
the electric field comes from
g
·
.
Electric Potential two
energy between charges
·
:
V 19 92 =
,
j
potential energy how much work YOU had to do to place the charge there .
-
, if charges are alike they repel
3
·
we are now talking about external
it does
·
if the field helps pos work -U
>
-
decreases work which equals potential energy)
the fielde
you fight
if
you dopos U increases not the field.
the electric
work -
> work done by
How to find the potential energy of an assembly of charges more than two sum
·
Force & displacement same direction
W >O
j ⑧
WAK
Ak = -
y
from potential
Moving energy (v)
+ to electric potential v
·
what if we just wanted to look at the electric field
V = U = V =
17
go
↳ How have here ?
much energy would I coulomb of charge
·
Finding electric potential from the electric field
Vincreases as you move inwards decreases as
you move outward/ in the direction of the E
·
E = f
T
V (work per
charge) -V =
Electric fields always V-lowV
go from high
·
AV = -
SE de :
-ESde
=
= -
Ey
AV = -
Ey
Gloses potential if pos
charge
total energy stays constant
,
but it can switch between :
Electric potential (
energy
·
·
Kinetic energy K
ki + Vi =
kf +
Uf
AK = -
AU
↑
·
a charge a in an electric field E feels a Force
F =
gE
pos charge same direction as E
·
:
neg charge :
opposite direction .
W =
/F -
d5 = -
Au
·
work done by the electric field neg-
:
change in potential energy
Case I : Charge moves with the electric field/same direction
WTO
W= -
AU
AU < 8
the electric field is
doing the work , charge is
"falling naturally"
·
potential energy decreases
Uf Vi
charge moving against the electric field -
need an external Force
<O
U >O
·
electric field is fighting the motion
Up > Vi
·
W= F d .
↳
·
same direction WO
Opposite direction -W < o
the electric field is whats doing this work
Electric Potential energy between two point charges
there is a source charge a in the center
you are
moving another
charge go from point ab
the electric field comes from
g
·
.
Electric Potential two
energy between charges
·
:
V 19 92 =
,
j
potential energy how much work YOU had to do to place the charge there .
-
, if charges are alike they repel
3
·
we are now talking about external
it does
·
if the field helps pos work -U
>
-
decreases work which equals potential energy)
the fielde
you fight
if
you dopos U increases not the field.
the electric
work -
> work done by
How to find the potential energy of an assembly of charges more than two sum
·
Force & displacement same direction
W >O
j ⑧
WAK
Ak = -
y
from potential
Moving energy (v)
+ to electric potential v
·
what if we just wanted to look at the electric field
V = U = V =
17
go
↳ How have here ?
much energy would I coulomb of charge
·
Finding electric potential from the electric field
Vincreases as you move inwards decreases as
you move outward/ in the direction of the E
·
E = f
T
V (work per
charge) -V =
Electric fields always V-lowV
go from high
·
AV = -
SE de :
-ESde
=
= -
Ey
AV = -
Ey
Gloses potential if pos
charge
total energy stays constant
,
but it can switch between :
Electric potential (
energy
·
·
Kinetic energy K
ki + Vi =
kf +
Uf
AK = -
AU
