First slide
Force on a charged particle moving in a magnetic field

A charged particle enters a uniform magnetic field with a velocity vector at an angle 450 with the magnetic field. The pitch of the helical path followed by the particle is p , the radius of the helix will be 


Pitch=p=(vcosθ)T r=mvsinθqBand T=2πmqB
 solving we get r=p2π

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