Political Science 1020E Lecture Notes - Lecture 15: Ebonite, Electrostatic Generator, Faraday Cage
2 Oct 2016
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The idea of a field resulted from a need to explain how one object (for example a charged ebonite rod) can have an effect on another object (a charged pith ball) over a distance. After all, they are not in direct contact. It is this action at a distance for which the concept of a field was initially developed. In this course we will learn about electric fields and magnetic fields (lesson 19). We learned about gravitational fields in physics 20. An electric field is generated by any object which has an electric charge. Electric fields can be produced by either positive or negative charged objects. Electric fields decrease in strength with increased distance. When a charge (q) is placed within an existing electric field it will experience a force. The r electric field strength (e the magnitude of the charge (q). r. ) at a given point is defined as the ratio of the electric force ( ef.
