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Question

An α particle is moving in a magnetic field of induction 0.4T with a velocity of 105ms1 describing a circle of radius r. A proton travelling with same speed in same direction in the same field will describe a circle of radius
  1. r/4
  2. r/2
  3. r
  4. 2r

A
r/4
B
r/2
C
2r
D
r
Solution
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