## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# Chapter 24 - Think and Discuss: 79

See below.

#### Work Step by Step

In an electric field E, a charge q feels a force of magnitude $q \times E$. This can increase the speed of a charged particle. The magnetic force that acts on a charged particle is always perpendicular to the particle's motion. It guides the particles into curved paths. There is no component of the force that acts along the instantaneous direction of motion, so the magnetic field cannot speed up, or slow down, a moving charged particle.

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