Learn This |
For All Force Fields
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Units |
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Force |
F=Eq
|
N |
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Electric Field Strength |
E=F/q |
N/C |
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Work (electric potential energy) |
W=EEP=qDV
|
J |
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Electric Potential |
DV=EEP/q (by definition) |
V |
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Uniform Electric Fields note 3 |
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Point Charge Electric Fields |
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Force |
F=DVq/d see note 1 |
F=kq1q2/r**2 or F=(1/4peo)q1q2/r**2 |
N |
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Electric Field Strength |
E=V/d |
E=kq/r**2 |
N/C |
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Work (electric potential energy) |
W=DEEP =Eqd see note 1 |
EEP=kq1q2/r see note 1,2 |
J |
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Electric Potential |
V=Ed |
V=kq/r or V=(1/4peo)q/r |
V |
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| note 1: not in IB Data Booklet |
| note 2: this equation not directly needed in IB |
| note 3: Although these are stated to be true for uniform fields they can be true for any field if the limit of the variables is infinitely small. For example E=V/d could be expressed in any field as E=DV/Dd where D - "delta" means change in. In this example we would say that the electric field strength is the gradient of the potential. |