Point Charge: Difference between revisions
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'''Step 2:''' Find the magnitude of the Electric Field | '''Step 2:''' Find the magnitude of the Electric Field | ||
'''Step 3:''' multiply the magnitude by <math>\hat{r}</math> to find the Electric Field. | |||
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Revision as of 21:09, 18 October 2015
This page is all about the Electric Field due to a Point Charge.
Electric Field
A Mathematical Model of Electric Field due to Point Charge
[math]\displaystyle{ \vec E=\frac{1}{4 \pi \epsilon_0 } \frac{q}{r^2} \hat r,\text{where } \frac{1}{4 \pi \epsilon_0 } \text{is about 9E9, q is the charge, r is the magnitude of the distance between the point charge and the observation point, and } }[/math] [math]\displaystyle{ \hat r \text { is the direction of the distance from the point charge to the observation point.} }[/math]
A Computational Model
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Simple
Problem 1: There is a proton at <1,2,3>. Calculate the electric field at <2,-1,3>.
Step 1: Find [math]\displaystyle{ \hat r }[/math]
Find [math]\displaystyle{ r_{obs} - r_{proton} (\lt 2,-1,3\gt - \lt 1,2,3\gt = \lt 1,-3,0\gt ) }[/math]
Calculate the magnitude of r. ([math]\displaystyle{ \sqrt{1^2+(-3)^2+0^2}=\sqrt{10} }[/math]
From r, find the unit vector [math]\displaystyle{ \hat{r}. }[/math] [math]\displaystyle{ \lt \frac{1}{\sqrt{10}},\frac{-3}{\sqrt{10}},\frac{0}{\sqrt{10}}\gt }[/math]
Step 2: Find the magnitude of the Electric Field
Step 3: multiply the magnitude by [math]\displaystyle{ \hat{r} }[/math] to find the Electric Field.
Middling
Difficult
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