An international system of electro-therapeutics : for students, general practitioners, and specialists . ction of the axis is related to the directionof the current as the thrust to the twist of a right-handed screw. Suchan arrangement is known as De La Rives floating battery. Hence, not only will a current make a magnet, but it is itself equiva-lent to a magnet. The form of the equivalent magnet depends altogetheron the form of the current. Taking a long spiral coil of wire it is equiva-lent to a long bar magnet whose north pole is where the current leavesthe magnet if it be a right-handed sp
An international system of electro-therapeutics : for students, general practitioners, and specialists . ction of the axis is related to the directionof the current as the thrust to the twist of a right-handed screw. Suchan arrangement is known as De La Rives floating battery. Hence, not only will a current make a magnet, but it is itself equiva-lent to a magnet. The form of the equivalent magnet depends altogetheron the form of the current. Taking a long spiral coil of wire it is equiva-lent to a long bar magnet whose north pole is where the current leavesthe magnet if it be a right-handed spiral, and vice versa if left-handed. 74. Momentary Current Produced by Motion of Another Cur-rent.—We have now seen that a moving magnet can generate a mo-mentary current in a conductor, and, further, that a current in a circuitis equivalent to a magnet. Hence it seems probable that a current inone moving circuit may generate a current in another circuit. That this is really so can be readily seen by inserting a spiral carry-ing a current into another spiral in circuit with a galvanometer and then. withdrawing it. In both cases momentary currents will be observed,whose directions are given by the above rule in § 12. Such momentary currents are called induced currents. 15. Momentary Current Produced by Varying Another Current.—We do not need, as above, to move the circuit carrying the influencingcurrent. It will serve the same purpose if we leave the influencing cir-cuit at rest, and simply start and stop a current in it. This will beequivalent to having a steady current in it and making it approach andrecede from the second circuit. On starting the current, then, in the inducing or primary circuit, wewill have an oppositely directed current induced in the influenced orsecondary circuit, and on stopping the current in the primary we willhave a direct current induced in the secondary circuit. The above phe-nomenon is often called mutual induction. It can be studied by laying
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectuterus, bookyear1894
