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A charged particle enters a unifrom mag...

A charged particle enters a unifrom magnetic field with velocity vector at an angle of `45^(@)` with the magnetic field . The pitch of the helical path followed by the particles is `rho` . The radius of the helix will be

A

`p/sqrt(2)pi`

B

`sqrt(p)`

C

`p/pi`

D

`sqrt(2)p/pi`

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