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An electron is moving along the axis of a solenoid carrying a current. Which of the following is a correct statement about the magnetic force acting on the electron?

Correct answer: D. No force acts

  • A. The force acts radially inwards
  • B. The force acts radially downwards
  • C. The force acts in the direction of motion
  • D. No force acts

Explanation

Consider the diagram of magnetic field shown and observe the magnetic field lines.Option D) When an electron moves along the axis of magnetic field in the solenoid the force acting on it will be given by F= qvB. As the electron is moving along the axis, θ will be zero and is zero.Hence no force will act on the electron.Option A, B & C all talk about forces and hence are wrong.

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About Electromagnetism

Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.

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