Excerpt from College Physics, Vol. 2: Electricity and Magnetism In order to explain attraction as well as repulsion, it was necessary to assume the existence of two different kinds of magnetism of opposite nature, positive and negative. Magnet ism was also assumed to be an imponderable substance, since the magnetization of a piece of iron or steel did not change its weight. We shall see later that this theory is unsatisfactory, and that the phenomena in question may be explained much better by the assumption that the medium between the poles is the real seat of magnetic action. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

This is part two of two for College Physics. This book covers chapters 18-34. Please note: The text and images in this textbook are grayscale and the format size has been reduced from 8.5" x 11" to 7.44" x 9.69." This introductory, algebra-based, two-semester college physics book is grounded with real-world examples, illustrations, and explanations to help students grasp key, fundamental physics concepts. College Physics includes learning objectives, concept questions, links to labs and simulations, and ample practice opportunities to solve traditional physics application problems.