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## Homework Statement

the e field is given by (2*pi*k*omega)[1-(1+(R^2)/(z^2))^-.5]

I was wondering if the capital R in that equation is the radius of the charged disk? And if so, why is it capitalized?

- Thread starter charlies1902
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the e field is given by (2*pi*k*omega)[1-(1+(R^2)/(z^2))^-.5]

I was wondering if the capital R in that equation is the radius of the charged disk? And if so, why is it capitalized?

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collinsmark

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Yeah, that looks about right to me! Good job.## Homework Statement

the e field is given by (2*pi*k*omega)[1-(1+(R^2)/(z^2))^-.5]

But I would use the Greek letter sigma, rather than omega, for the surface charge density. There's no particular reason for that except it's more conventional.

[tex] \vec E = 2 \pi k \sigma \left(1 - \frac{1}{ \sqrt{1+ \frac{R^2}{z^2}}} \right) \hat z[/tex]

where [itex] \hat z [/itex] is a unit vector in the

Yes.I was wondering if the capital R in that equation is the radius of the charged disk?

So as not to confuse it withAnd if so, why is it capitalized?

The above equation happens to work in both Cartesian coordinates (

You can't just pick any old

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