STANDARD Physics Motion in Magnetic Field MCQ Question
An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
The electron will be accelerated along the axis.
The electron path will be circular about the axis.
The electron will experience a force at 45° to the axis and hence execute a helical path.
The electron will continue to move with uniform velocity along the axis of the solenoid.
Correct Answer
Detailed Explanation
Let the electron (e) be projected with a uniform velocity (v) in a uniform magnetic field B. The force on it is |F| = |e|vBsinθ. As θ = 0°, |F| = 0. Hence the electron will continue to move with a uniform velocity along the axis of the solenoid.
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