Field angular momentum in Feynman's disk paradox

Tzu Chiang Ernest Ma

Research output: Contribution to journalLetterpeer-review

8 Scopus citations


The angular momentum in static electromagnetic fields has always been a fascinating subject.1-10 Feynman's disk paradox1 is a striking example of this. In their recent article on Feynman's disk paradox, Bahder and Sak2 calculated the angular momentum in two ways, one by using Faraday's law, the other by using Lorentz force law. Although it was asserted that the angular momentum is stored in the fields, the direct approach to calculate this angular momentum from the fields has not been shown. We present this calculation so that students may understand the reason angular momentum is said to be stored in the fields.

Original languageEnglish
Pages (from-to)949-950
Number of pages2
JournalAmerican Journal of Physics
Issue number10
StatePublished - Oct 1986


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