Recent content by pager48
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High School Potassium or other minerals and the photoelectic effect
This was in regards to whether a metal can emanate more electrons from a higher energetic UVC emitter. Whats the rate of electrons emmited and at which velocity from a 3^2cm potassium surface area from a typical 8w mercury enclosed in quartz UVC emitter? Supposing the lamp would be 2-3 inches...- pager48
- Post #3
- Forum: Quantum Physics
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High School Potassium or other minerals and the photoelectic effect
Would UVC shined onto Potassium cause it to emanate more electrons than its specific work function? Does only the specific work function per mineral cause the mineral to emanate electrons or more energetic sources can also cause it to do the same without using its specific work function?- pager48
- Thread
- Minerals
- Replies: 3
- Forum: Quantum Physics
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Undergrad The capacitance of an isolated sphere
Going to investigate figure 4 from attached publication. Maybe there is a publication baring that information but its likely buried somewere and its emphisis is likely not about isolated spherical capacitors. The attached publication has an attached conductor which is grounded you mentioned...- pager48
- Post #23
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Would spraying the sphere with adhesive spray and dipping it into barium titanate or calcium copper titanate powder making several coats raise the spheres capacitance? There is also titanium dioxide powder which is much less expensive. Can you describe the nearby grounded conductor arrangement...- pager48
- Post #21
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
In that case the only ways to increase capacitance is bigger sphere or coating sphere with high K value dielectric material?- pager48
- Post #19
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Isn't permittivity in air 1 making capacitance ~628pF?- pager48
- Post #17
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Isn't for a 10cm sphere its 4pi*50 = ~628pF ?- pager48
- Post #14
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Then it does not matter if the sphere is hollow or solid to be a capacitor?- pager48
- Post #11
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Is the isolated sphere capacitors dielectric inside the sphere?- pager48
- Post #9
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
According to the isolated sphere capacitance formula better dielectric means more capacitance. Were is the dielectric located in an isolated sphere capacitor? But any instrument adds some sort of error why is measuring isolated sphere capacitance any different than measuring ordinary capacitors?- pager48
- Post #7
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
Connecting any instrument makes the sphere have no capacitance?- pager48
- Post #5
- Forum: Electromagnetism
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Undergrad The capacitance of an isolated sphere
according to http://230nsc1.phy-astr.gsu.edu/hbase/electric/capsph.html#c2 isolated spheres have capacitance but how can it be measured with an instrument?- pager48
- Thread
- Capacitance Sphere
- Replies: 23
- Forum: Electromagnetism
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Graduate Are these instances of identical magnetic fields?
Are both magnetic fields emanated from an electromagnet fed with a current spike from a charge capacitor and a rotating static magnetic field from permanent magnets instances of time varying fields? The permanent magnet would be attached to perhaps some rotating disc thus passing over a target...- pager48
- Thread
- Eddy current Electromagetism Fields Magnetic Magnetic fields Magnetism
- Replies: 1
- Forum: Electromagnetism
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Graduate Why Does High Frequency Corona Tend to Orient Vertically?
I noticed high frequency (greater than 800khz) corona tends to orientate vertically as if it were a flame with a strong air blower beneath it regardless of electrode positioning. This is not the case for DC and low frequency AC corona. Is there a reason why high frequency corona orientates...- pager48
- Thread
- Corona Discharge Orientation
- Replies: 1
- Forum: Electromagnetism
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Medical Eddy Current Hazards: Magnetic Field & Human Body
For this it can be a 10mS duration pulse.- pager48
- Post #3
- Forum: Biology and Medical