Laser trapping of microscopic particles for undergraduate experiments
We present detailed instructions for constructing and operating an optical trap using a hollow core fiber and two-laser beams. The trap is stable, confining 100-nm to 10-µm particles of a variet...
We present detailed instructions for constructing and operating an optical trap using a hollow core fiber and two-laser beams. The trap is stable, confining 100-nm to 10-µm particles of a variet...
Lorentz transformation of a system carrying "Hidden Momentum"
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The relations between an energy–momentum tensor and its corresponding energy–momentum four-vector are discussed. A particular emphasis is put on conditions guaranteeing that spatial integral...
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Surface charges and fields of simple circuits
American Journal of Physics -- November 2000 -- Volume 68, Issue 11, pp. 1002-1006
Issue Date: November 2000
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BibSonomy
KEYWORDS and PACS
- 01.50.-i
Communication, education, history, and philosophy Educational aids - 84.30.Bv
Electronics; radiowave and microwave technology; direct energy conversion and storage Electronic circuits Circuit theory (including computer-aided circuit design and analysis) - 84.32.Ff
Electronics; radiowave and microwave technology; direct energy conversion and storage Passive circuit components Conductors, resistors (including thermistors, varistors, and photoresistors) - 84.32.Tt
Electronics; radiowave and microwave technology; direct energy conversion and storage Passive circuit components Capacitors - YEAR: 2000
PUBLICATION DATA
0002-9505 (print)
AAPT
Interest in the surface charges on circuits, and their utility in the conceptual understanding of circuit behavior, has recently increased. Papers and textbooks have discussed surface charges either with qualitative diagrams or analytic results for very special geometries. Here, I present the results of numerical calculations showing the surface charges on several simple resistor-capacitor circuits. Surface charges are seen to guide the motion of charges and create the appropriate electric potential and Poynting vectors for the circuit, and hence are an important factor in the teaching of circuit theory. ©2000 American Association of Physics Teachers.
| History: | Received 20 October 1999; accepted 3 March 2000 |
| Permalink: | http://dx.doi.org/10.1119/1.1286115 |