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American Journal of Physics Volume 86 Issue 6

Subject Areas: Physics and Astronomy (miscellaneous)
Publisher: American Association of Physics Teachers - American Association of Physics Teachers
ISSN: 0002-9505
SJR: 99

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Journal Article

Comment on Sanders Guest Editorial

Cameron Reed, B.

2018 American Journal of Physics

doi:10.1119/1.5036944
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Journal Article

Diffraction effects in mechanically chopped laser pulses

Gambhir, Samridhi; Singh, Mandip

2018 American Journal of Physics

doi:10.1119/1.5029821

A mechanical beam chopper consists of a rotating disc of regularly spaced wide slitswhich allow light to pass through them. A continuous light beam, after passing through therotating disc, is switched-on and switched-off periodically, and a series of opticalpulses are produced. The intensity of...
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Quantum entanglement with Freedman's inequality

Brody, Jed; Selton, Charlotte

2018 American Journal of Physics

doi:10.1119/1.5036619

The assumption of local realism imposes constraints, such as Bell inequalities, onquantities obtained from measurements. In recent years, various tests of local realismhave gained popularity in undergraduate laboratories, giving students the excitingopportunity to experimentally contradict this...
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Theory and experiment on charging and discharging a capacitor through a reverse-biased diode

Roy, Arijit; Mallick, Abhishek; Adhikari, Aparna; Guin, Priyanka; Chatterjee, Dibyendu

2018 American Journal of Physics

doi:10.1119/1.5026994

The beauty of a diode lies in its voltage-dependent nonlinear resistance. The voltage ona charging and discharging capacitor through a reverse-biased diode is calculated frombasic equations and is found to be in good agreement with experimental measurements.Instead of the exponential dependence...
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On Faraday's law in the presence of extended conductors

Bilbao, Luis

2018 American Journal of Physics

doi:10.1119/1.5034445

The use of Faraday's Law of induction for calculating the induced currents in an extendedconducting body is discussed. In a general case with arbitrary geometry, the solution tothe problem of a moving metal object in the presence of a magnetic field is difficult andimplies solving Maxwell's...
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The metallic sphere in a uniform ac magnetic field: A simple and precise experiment for exploring eddy currents and non-destructive testing

Honke, Michael L.; Bidinosti, Christopher P.

2018 American Journal of Physics

doi:10.1119/1.5034350

We describe a very simple experiment that utilizes standard laboratory equipment to measure the electromagnetic response of a metallic sphere exposed to a uniform ac magnetic field. Measurements were made for a variety of non-magnetic and magnetic metals, and in all cases the results fit very...
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Journal Article

Sympathetic resonance

Virgin, Lawrence N.

2018 American Journal of Physics

doi:10.1119/1.5025037

This short paper describes a useful teaching tool, ideal for demonstration purposes within the classroom or lab setting. It is based on the simple dynamic response of flexible cantilevers and evolves naturally from the underlying principles of a vibrating reed tachometer. Utilizing a 3D-printer,...
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Journal Article

Drag and lift forces between a rotating conductive sphere and a cylindrical magnet

Nurge, Mark A.; Youngquist, Robert C.; Starr, Stanley O.

2018 American Journal of Physics

doi:10.1119/1.5024220

Modeling the interaction between a non-uniform magnetic field and a rotating conductive object provides insight into the drag force, which is used in applications such as eddy current braking and linear induction motors, as well as the transition to a repulsive force, which is the basis for...
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On a nonlinear Newtonian gravity and charging a black hole

Good, Michael R. R.

2018 American Journal of Physics

doi:10.1119/1.5030543

A scalar field gravitational analog of the Reissner-Nordstrom solution is investigated. The nonlinear Newtonian model has an upper-limit of charge for a central mass, which agrees with the general relativistic condition required for the existence of the black hole horizon. The maximum limit for...
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Exploring cogging free magnetic gears

Borgers, Stefan; Völkel, Simeon; Schöpf, Wolfgang; Rehberg, Ingo

2018 American Journal of Physics

doi:10.1119/1.5029823

The coupling of two rotating spherical magnets is investigated experimentally, with particular emphasis on those motions in which the driven magnet follows the driving one with a uniform angular speed, which is a feature of the so called cogging free couplings. The experiment makes use of...

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