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PH 223 26:5-7

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by

Richard Datwyler

on 21 October 2016

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Transcript of PH 223 26:5-7

Air breaks down when the electric field strength reaches 3.0 X 10^6 N/C, causing a spark. A parallel-plate capacitor is made from two 4 x 4 cm plates. How many electrons must be transferred from one disk to the other to create a spark between the disks.
The surface charge density of an infinite charged plane is -2.0 X 10^6 C/m^2. A proton is shot straight away from the plane at 2.0 X 10^6 m/s. How far does the proton travel before reaching its turning point?
In a classical model of the hydrogen atom, the electron orbits a stationary proton in a circular orbit. What is the radius of the orbit for which the orbital frequency is 1.0 X 10^12 Hz?
An infinitely long sheet of charge of width L lies in the xy-plane between x=−L/2 and x=L/2. The surface charge density is η. Derive an expression for the electric field E along the x-axis for points outside the sheet (x>L/2) for x>0.
recall
"What is an electron gun?"
"What are some practical applications for capacitors? How dangerous are they?"
"So in 26.7 we read about the torque on a dipole, but why is it important?"
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