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Standard XII
Physics
Question

An electron is not deflected on passing through a certain region, because
  1. there may be magnetic field but the velocity of electron may be parallel to the direction of magnetic field
  2. there is magnetic field in that region and the electron enters into it in any direction.
  3. electron is a chargeless particle
  4. there is electric field and the electron enters into it in any direction.

A
there is magnetic field in that region and the electron enters into it in any direction.
B
electron is a chargeless particle
C
there is electric field and the electron enters into it in any direction.
D
there may be magnetic field but the velocity of electron may be parallel to the direction of magnetic field
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Solution
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only B is possible because →B∥→v

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