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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
An electron is projected with uniform velocity along the axis inside a current carrying long solenoid. Then :
  • A
     the electron will be accelerated along the axis.
  • ✓
    the electron will continue to move with uniform velocity along the axis of the solenoid.
  • C
    the electron path will be circular about the axis.
  • D
     the electron will experience a force at $45^{\circ}$ to the axis and execute a helical path.
✓

Answer

Correct option: B.
the electron will continue to move with uniform velocity along the axis of the solenoid.
b
Since $\vec{v} \| \vec{B}$ so force on electron due to magnetic field is zero. So it will move along axis with uniform velocity.

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