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Question

A proton and an α -particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 μ second to make 5 revolutions, then times period for the α-particle would be
  1. 50 μ sec
  2. 25 μ sec
  3. 10 μ sec
  4. 5 μ sec

A
50 μ sec
B
5 μ sec
C
25 μ sec
D
10 μ sec
Solution
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Time taken by proton to make one revolution =255=5μsec.

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