An electron having mass $m$ and kinetic energy $K$ enter in uniform magnetic field $B$ perpendicularly, then its frequency will be
  • A$\frac{e K}{q v B}$
  • B$\frac{e B}{2 \pi m}$
  • C$\frac{2 \pi m}{e B}$
  • D$\frac{2 m}{e B K}$
AIPMT 2001, Medium
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