ERIC Number: EJ963896
Record Type: Journal
Publication Date: 2011-Nov
Abstractor: As Provided
Reference Count: 7
Radiation Forces and Torques without Stress (Tensors)
Bohren, Craig F.
European Journal of Physics, v32 n6 p1515-1518 Nov 2011
To understand radiation forces and torques or to calculate them does not require invoking photon or electromagnetic field momentum transfer or stress tensors. According to continuum electromagnetic theory, forces and torques exerted by radiation are a consequence of electric and magnetic fields acting on charges and currents that the fields induce within illuminated objects. This can be shown directly by deriving the radiation force and torque resulting from normal-incidence illumination of a planar interface between free space and an arbitrary medium. Every point of the medium contributes to the total force and torque, which are therefore not localized.
Descriptors: Physics, Radiation, Science Instruction, Magnets, Scientific Principles, Energy, Equations (Mathematics), College Science, Geometric Concepts, Undergraduate Study
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Authoring Institution: N/A