Lorentz Force by Jared Rovny, PhD

Name: Lorentz Force
Uploaded: 2016-12-16
Duration: 8 min 12 s
Description: The lecture Lorentz Force by Jared Rovny, PhD is from the course Magnetism.

About the Lecture

The lecture Lorentz Force by Jared Rovny, PhD is from the course Magnetism.

Included Quiz Questions

Which of the following is true about the magnetic force experienced by a charge moving in a magnetic field?

The direction of the force will always be perpendicular to both the magnetic field and charge velocity.
The magnitude is independent of the charge of the moving particle.
The direction of the force will always point along the direction of the field.
The magnetic force is in the direction of the velocity of the particle.
The magnetic force is always perpendicular to the velocity of the particle but can be non-perpendicular to the magnetic field.

What is the angle θ in the expression for the magnitude of the magnetic force exerted on a charged particle moving in a magnetic field given by: |F_B | = qvB sinθ?

It is the angle between the velocity vector and the magnetic field
It is the angle between the displacement of the charge and the magnetic field
It is the angle between the displacement of the charge and the velocity vector
It is the angle between the velocity vector and the magnetic force
It is the angle between the magnetic force and the magnetic field

Why is it not possible for a magnetic force to do work on a charge?

The magnetic force and direction of motion of charges are always perpendicular.
The magnetic force is perpendicular to the magnetic field.
The net magnetic force is always zero.
The velocity vector and magnetic field are perpendicular.
The magnetic force exerted by a magnetic field on a charge is negligible compared to an electric force hence the work done is negligibly small.

What is the expression for the speed of a charged particle moving in uniform circular motion in a cyclotron in terms of the charge of the particle q, the mass of the particle m, the magnetic field B, and the radius of the circular motion r?

v = qrB/m
v = qB/(rm)
v = rB/(qm)
v = qr²B/m
v = qr/(Bm)

What is the Lorentz force?

The sum of the magnetic and electric forces exerted on a charged particle
Another name for the magnetic forces
The magnetic and centripetal forces exerted on a charged particle in a cyclotron
The Coulomb and the centripetal forces exerted on a charged particle
The sum of the magnetic forces and gravitational forces exerted on an object. Similar to the forces that magnetic objects experience near the surface of the earth.