Lorentz force

An electron enters the magnetic field in the direction parallel to the magnetic field lines. In the magnetic field:

• Its direction and velocity remain constant

• Accelerates moving in the direction of the magnetic field

• Decelerates moving in the opposite direction to the magnetic field

• Starts moving perpendicular to the magnetic field lines

Ions that are in a mass spectrometer will move with the shortest radius when:

• its speed increases

• its mass increases

• its charge increases

• magnitude of the magnetic field decreases

A charged particle that enters the magnetic field perpendicular to the magnetic field lines will move in a:

• circle

• straight line

• parabola

• ellipse

A charged particle that enters the magnetic field parallel to the magnetic field lines will move in a:

• circle

• straight line

• parabola

• ellipse

The sketch shows charged a particle that is entering an uniform magnetic field B. The particle starts moving in a circle, as shown. Charge of the particle is:

• Positive

• Negative

• We can not determine