This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...must be transverse both to the lines of magnetic force and to the direction of its motion through them. The following rule will be found convenient for ascertaining the direction in which electricity is generated in accordance with Faraday's law: --Let the observer have before him a conductor in the vertical ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...must be transverse both to the lines of magnetic force and to the direction of its motion through them. The following rule will be found convenient for ascertaining the direction in which electricity is generated in accordance with Faraday's law: --Let the observer have before him a conductor in the vertical direction, if the magnetic lines are from his right hand towards his left, and if he thrusts his hands forward so that the lines of force pass through the conductor in that direction, electricity is generated in the downward direction. If either the direction of the magnetic lines, or the direction of motion through them, be reversed, the direction of electrification is upwards in the conductor. It is assumed in the rule that the conductor is at right angles to the magnetic lines, and also to the direction in which the conductor passes through them, and in these circumstances the electrifying force is at its maximum. If the conductor makes an angle A with a normal to the magnetic lines, and an angle B with a normal to the direction of motion, both the magnitude and direction of electrification are expressed by the formula cos A cos B. The process of producing an electric current by means of magnetic lines may be called magneto-electrification. The converse process of producing magnetic lines by means of an electric current is called electro-tnagnetisation. There is a close analogy between the two processes, and the laws for both are nearly the same. The lines of magnetic force offer resistance to the passage of the conductor through them, and work is necessary for that purpose. That work is expended in polarising the particles of the conductor. The positive points of the monads are attracted towards the negative pole of the magnet, and their...
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