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An electron is not deflected in passing ...

An electron is not deflected in passing through a certain region of space. Can we be sure that there is no magnetic field in that region ?

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The magnetic force on the electorn would be zeron if its velocity `vecv` is along the magnetic field `vecB`, because `vecF_(m)=evecvxx vecB`. Then the electron wouel bot be defleted evenif a non-zero magnetic field is present.
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