. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Field of two equal unlike 4. Field of two equal like charges. It must be understood that these lines of force have no real existence,but merely serve as a convenient means of indicating the character ofthe field. In the development of electrical theory by Faraday andMaxwell it is shown that they represent stresses in the ether, and thatall forces on electrified bodies may be explained by supposing that the 26 ELECTROSTATICS ether exerts a tension along the hnes of force and a pressure
. Electricity : its medical and surgical applications, including radiotherapy and phototherapy . Field of two equal unlike 4. Field of two equal like charges. It must be understood that these lines of force have no real existence,but merely serve as a convenient means of indicating the character ofthe field. In the development of electrical theory by Faraday andMaxwell it is shown that they represent stresses in the ether, and thatall forces on electrified bodies may be explained by supposing that the 26 ELECTROSTATICS ether exerts a tension along the hnes of force and a pressure perpen-dicular to them; as if they tended to contract and to repel each a glance at Figs. 3 and 4 will show how on this interpretation twounlike charges are drawn together while like charges are driven apart. Energy of the Field; Potential.—Every electrical field possesses anamount of energy which is equivalent to the work done in separatingthe charges and placing them in position against the electrical energy is of the form known as energy of position, or potentialenergy (p. 23). An analogy which may be of
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