Case Study: Read the following paragraph and answer the questions:
In a beam of charged particles, not all particles move with the same speed. A charged porticle with mass m, charge q and speed v 'enters a region of space where.-electric field and magnetic fields are perpendicular to particle's velocity and to each other. Magnetic force is upward with magnitude qVB. When the total force is zero, there is no deflection om `(v) = (E) /( B) `

Electron with uniform velocity is projected along the axis of a current carrying solenoid. Then:

Options

A. The electron path will be circular about the axis
B. The electron will be accelerated along the crisis
C. The electron will experience a force at `45^(@)` to the axis executing helical path
D. Electron will continue to move with uni form velocity along the axis of solenoid

Answer

D

Explanation

Electron will continue to move with uniform velocity along the axis of solenoid.