91Ó°ÊÓ

Explain how and why you expect the magnetic declination to change as you travel eastward from California to New York.

Explain how and why you expect magnetic inclination to change as you travel southward from Canada to Mexico.

The electric field is defined to be in the direction of the electric force on a positively charged particle. Why isn't the magnetic field defined to be in the direction of the magnetic force on a positively charged particle?

A negatively charged particle is moving horizontally in a region with a magnetic field directed vertically upward. Describe the particle's motion.

Discuss the trajectory of a charged particle in a magnetic field when the particle's velocity is not perpendicular to the field. Explain why the motion is a helix, such that the particle's velocity component in the direction of the magnetic field is constant, and the motion in the perpendicular direction is circular.

A charged particle is in jected into a uniform magnetic field. If the angle between the particle's velocity and the magnetic field is \(45^{\circ},\) describe the particle's trajectory.

Does the magnetic force ever do work on a moving charged particle?

If magnetic fields do no work, is it also true that they don't accelerate charged particles?

An uncharged particle will always pass through a velocity selector with no deflection. Describe how you could use the velocity selector to determine whether you have a beam of uncharged particles.

You're looking down on a positively charged particle moving in a clockwise circle. In what direction is the resulting magnetic moment? What if it's a negatively charged particle moving in the same direction?