. Dental electro-therapeutics. A, direction of current before break; B, induced current at break. of current in the wire, precisely in the same manner as thefield about a magnet, forming, as it were, concentric circles 80 ELECTRO-PHYSICS about the wire; when the wire is bent in the shape of acoil the magnetic field of force is increased, but the re- Fig. 21. Field of force about a wire. sistance is also increased, so the strength of the magneticfield will depend on the strength of the current and will be Fig. 22

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