A Ninth-Grade Physics Experiment.

The ninth grade continues its study of the foundations of electrodynamics into the second half of the current school year. The present article consists of brief descriptions of demonstrations and laboratory experiments on this topic that have been selected in accordance with the content of the ninth-grade physics textbook. The order in which these descriptions is given also coincides with the order in which the material is presented in the textbook. In some cases, supplementary experiments are described where it appeared necessary. [ABSTRACT FROM AUTHOR]