Question

An electron is projected with uniform velocity along the axis of a current carrying long solenoid. Which of the following is true?
A. The electron will be accelerated along the axis
B. The electron path will be circular abou the axis.
C. the electronw ill experience a force at `45^(@)` to the xis and hence execute a helical path.
D. The electron will continue to mocve with uniform velocity along the axis of the solenoid.

Answer 1

Correct Answer - D
Magnetic lorentz force electron is projected with uniform velocity along the axis of a current carrying long solenoid `F=-evBsin180^(@)=0(theta=0^@)` as magnetic field and velocity are paralle. The electron will continue to move with uniform velocity along the axis of the solenoid.