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Question

A proton is projected with a velocity 107m/s at right angle to a uniform magnetic field of induction 100 mT. The time taken by proton to traverse 90 arc is
  1. 0.8×107s
  2. 1.57×107s
  3. 2.43×107s
  4. 3.24×107s


Solution

The correct option is B 1.57×107s
T=2πmBq=2×3.14×1.6×10270.1×1.6×1019T=6.28×107sect=T4=6.28×1074=1.57×107s
 

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