Priscilla G.

asked • 06/10/22

What is the difference in voltage between the plates? Science

Two large parallel plates are 2.0 cm apart. The strength of the electric field between them is 100.0 N/C . What is the difference in voltage between the plates?


(a) −2.0 V


(b) +2.0 V


(c) 0 V


(d) +20 V


I think it's (A), but I'm not completely confident.


Luke J.

A fully fledged answer is to follow but voltage differences across capacitors (at least in the studies I've gone thru thus far) are always positive because of the orientation that it's typically measured. It would essentially have to balance out if you read a negative Electric Field then you'd get a negative Voltage Difference and vice versa.
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06/10/22

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Luke J. answered • 06/10/22

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I don't have where the equation comes from, but the equation for a voltage difference, V, across capacitor surfaces separated by a distance, d, with an electric field strength, E is:


V = E * d


V = ( 102 N/C ) * ( 2* 10-2 m )


∴ V = +2 V, thus the correct choice is the answer choice (b)


I hope this helps! Message me in the comments if you have any questions, comments, or concerns!

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Priscilla G.

Thank you, it was correct
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06/10/22

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