# Essentials of Physics for College Students; A Textbook for Undergraduates and a Lecture Course and Reference Work for Teachers and Other Students of Physics

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## Description

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...the surface density of the electrification; hence the surface density may be represented by the number of unit lines or the number of tubes of force that proceed from or to the electrified body per unit area. (See further, Watson, pp. 624-634.) Given a small sphere uniformly charged with q units of elec tricity, if this sphere is remote from other charged bodies it will have q tubes of force radiating from it and filling the space around it. A spherical surface surrounding this small sphere at a distance 1' will have 4 1172 units of area, comprising the ends of q tubes of force; therefore the number of tubes per unit of area will be If the small charged sphere is extremely small we, r may regard its charge as all at the center of the large sphere, and the force due to it at a distance r is g; this, too, is the strength of field at the distance r, that is, at the surface of the large sphere. Thus, since the number of tubes per square centimeter of this be written-3-; X 4 11-.-Also if the area of cross section of a tube 4 1rr is s square centimeters, the number of tubes per square centi meter isi; writing F for the strength of field, or the force at The cross section of the tube is supposed to be perpendicular to the line of force or on an equipotential surface. 169. Tubes of Induction.--The product of the electrical force into the area of a surface perpendicular to the direction of the force is called the " electrical induction " through that surface; and we see that the induction through a normal cross section of a tube of force is constant and equals.4 1r. If we call a unit tube of induction one in which the induction is unity, the unit tube of force equals 4 1r unit tubes of induction. Thus on each square centimeter of the...show more

## Product details

• Paperback | 142 pages
• 189 x 246 x 8mm | 268g
• United States
• English
• black & white illustrations
• 1236969103
• 9781236969101