A proton in a magnetic field does not experience aforce. Which of the following

Question

A proton in a magnetic field does not experience aforce. Which of the following statements is correct withrespect to this situation? I. The proton may have a velocity of zero m/s. II. The proton may be moving parallel to the direction of themagnetic field. A) Statement I only B) Statement II only C) both statement I and statement II D) neither statement I or statement II WHy?? A proton in a magnetic field does not experience aforce. Which of the following statements is correct withrespect to this situation? I. The proton may have a velocity of zero m/s. II. The proton may be moving parallel to the direction of themagnetic field. A) Statement I only B) Statement II only C) both statement I and statement II D) neither statement I or statement II WHy??

Explanation / Answer

F = q.v.B.Sin a
where, q is charge, v is velocity, B is megnatic field and ais the angle between v and B. In this case, charge is not zero. B is also not zero. Thefactors that can make F equal to zero are
1. v (if velocity is zero) 2. a (if sin a is zero, a is also zero, so, v and B areparallel)
So, the answer is C.

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