If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then -

Concept:

A charged particle in motion in a magnetic field experiences a force at right angles to its velocity and the Magnetic field intensity, i.e.

\(\vec F=q(\vec v \times \vec B)\)

F = qvB sin θ

Calculation:

Given:

The direction of magnetic field B and the velocity of the electron is in the same direction, therefore the angle between them is 0°.

F = qvB sin θ

F = qvB sin 0 = 0

As the force acting is zero, therefore the electron will continue to move in the same direction with the same velocity.