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4. Moving charges and magnetism — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics4. Moving charges and magnetism1 Mark
MCQ
If a proton is projected in a direction perpendicular to a uniform magnetic field with velocity $v$ and an electron is projected along the lines of force, what will happen to proton and electron
  • A
    The electron will travel along a circle with constant speed and the proton will move along a straight line
  • ✓
    Proton will move in a circle with constant speed and there will be no effect on the motion of electron
  • C
    There will not be any effect on the motion of electron and proton
  • D
    The electron and proton both will follow the path of a parabola
✓

Answer

Correct option: B.
Proton will move in a circle with constant speed and there will be no effect on the motion of electron
b
(b) Maximum force will act on proton so it will move on a circular path. Force on electron will be zero because it is moving parallel to the field.

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