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Question

Protons and α-particles of equal momenta enter a uniform magnetic field normally. The radii of their orbits will have the ratio
  1. 1
  2. 2
  3. 0.5
  4. 4

A
4
B
1
C
2
D
0.5
Solution
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r=mvqB

=pqBrprα

=qαqp=2ee=21

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