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Old 5th April 2012, 07:11 PM   #1
akis is offline akis  United Kingdom
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Default Electric fields

Hello

Did not know where else to post this question - how do I translate the strength of an electric field say across the plates of a capacitor from say 1V/cm to something more common, eg Volts?

Thanks
Akis
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Old 5th April 2012, 07:21 PM   #2
Lukas87 is offline Lukas87  Czech Republic
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Just multiply the E (in V/m) by the distance (in m, of course) between the plates.
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Old 5th April 2012, 07:28 PM   #3
DF96 is offline DF96  England
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The strength of an electric field is V/m (volts per metre). If you want something more common that that I suppose you could convert it to volts per foot or volts per inch.
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Old 5th April 2012, 08:30 PM   #4
akis is offline akis  United Kingdom
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Quote:
Originally Posted by Lukas87 View Post
Just multiply the E (in V/m) by the distance (in m, of course) between the plates.
I figured as much. So 1V/cm across say 15cm is really 15 Volts.
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Old 5th April 2012, 08:36 PM   #5
DF96 is offline DF96  England
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No. 1V/cm is the strength of the electric field. If this field strength is maintained over a distance of 15cm then you will get a potential difference of 15V. Two different measurements of two different things: electric field and potential.

Its like the difference between the height of a hill and the slope. Both tell you something about the hill, but they tell you different things so are measured in different units.
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Old 5th April 2012, 08:42 PM   #6
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Quote:
Originally Posted by akis View Post
Hello

Did not know where else to post this question - how do I translate the strength of an electric field say across the plates of a capacitor from say 1V/cm to something more common, eg Volts?

Thanks
Akis
You don't, an electric field is an electric field, if you want to know volts you need to measure volts.
Quote:
I figured as much. So 1V/cm across say 15cm is really 15 Volts.
Yes, though most practical applications are more likely to be measured in v/um
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Old 6th April 2012, 01:15 PM   #7
Lukas87 is offline Lukas87  Czech Republic
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Dear Akis - look on the problem in a way that the E is like the slope of the hill and the V is like the height. It will be all much easier to understand.

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Its like the difference between the height of a hill and the slope.
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