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STD 12 - 4. Moving charges and magnetism — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. Moving charges and magnetism4 Marks
MCQ
An electron enters a region where magnetic $(B)$ and electric $(E)$ fields are mutually perpendicular to one another, then
  • A
    It always possess circular motion
  • B
    It will always move in the direction of $B$
  • C
    It will always move in the direction of $E$
  • ✓
    it can go undeflected also
✓

Answer

Correct option: D.
it can go undeflected also
d
when electrons enter in a region where there is only magnetic field, then force exerted by the magnetic field will deflect the electron in a direction perpendicular to its motion and also perpendicular to the magnetic field. Whereas in the presence of electric field, force exerted by the electric field is in a direction opposite to the direction of electric field. As a result, electron deflected by magnetic field is nullified by the deflection by electric field. As a result, electron moves undeflected.

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