An electron (charge $q$ $coulomb$) enters a magnetic field of $H$ $weber/{m^2}$ with a velocity of $v\,m/s$ in the same direction as that of the field the force on the electron is
  • A$Hqv$ Newton’s in the direction of the magnetic field
  • B$Hqv$ dynes in the direction of the magnetic field
  • C$Hqv$ Newton’s at right angles to the direction of the magnetic field
  • D
    Zero
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