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
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$\mathrm{p}=\frac{2 \pi \mathrm{mv} \cos \theta}{\mathrm{qB}}$
$\mathrm{R}=\frac{\mathrm{mv} \sin \theta}{\mathrm{qB}}=\frac{\mathrm{p}}{2 \pi} \tan \theta$
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