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A charged particle enters a uniform magnetic field with velocity vector making an angle of $30^o$ with the magnetic field. The particle describes a helical trajectory of pitch $x$ . The radius of the helix is
  • A$\frac{x}{{2\pi }}$
  • B$\frac{x}{{2\sqrt 2 \pi }}$
  • C$\frac{x}{{2\sqrt 3 \pi }}$
  • D$\frac{{\sqrt 3 x}}{{2\pi }}$
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