A non-relativistic charged particle enters a uniform magnetic field perpendicularly and completes exactly a semicircle before leaving the field region. How long does it spend in the field?
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A non-relativistic charged particle enters a uniform magnetic field perpendicularly and completes exactly a semicircle before leaving the field region. How long does it spend in the field?

G1 Physics · Accepted Answer

A semicircle takes half a cyclotron period: t=T/2=πm/(|q|B).