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An elelctron moves with velocity `vecv=ahatk` in a magnetic field, `vecB=bhati+chatj`. Find the magnetic force on the electron.

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An elelctron moves with velocity `vecv=ahatk` in a magnetic field, `vecB=bhati+chatj`. Find the magnetic force on the electron.
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The force on electron in the magnetic field is
`vecF=-e(vecvxxvecB)=-e[ahatkxx(bhati+chatj)]`
`=-e[abhatj+ac(-hati)]=ea[chati-bhatj]`
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