1. Tardigrade
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  3. Physics
  4. The figure shows three situations when an electron with velocity vec v travels through a uniform magnetic field vec B . In each case, what is the direction of magnetic force on the electron?

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Q. The figure shows three situations when an electron with velocity $\vec{ v }$ travels through a uniform magnetic field $\vec{ B }$. In each case, what is the direction of magnetic force on the electron?Physics Question Image

AIIMSAIIMS 2007

Solution:

According to Fleming's left hand rule, in figures (1) and (2) magnetic force on the electron will be directed in -ve $z$-axis and -ve $x$-axis respectively. In figure (3) velocity of electron and direction of magnetic field are antiparallel, so no force will act on electron.