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Q.

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

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a

p2π

b

2p

c

p2π

d

2pπ

answer is C.

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Detailed Solution

p=2πmBqvcos45°=2πmBqvsin45° ∴  mvsin45°Bq=p2π= radius of helix
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A charged particle enters a uniform magnetic field with velocity vector at an angle of 450 with the magnetic field.The pitch of the helical path followed by the particle is p.The radius of the helix will be