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Practical Notes for Electrical Students. Vol. I. Laws, Units and Simple Measuring Instruments

Practical Notes for Electrical Students. Vol. I. Laws, Units and Simple Measuring Instruments


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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. 1890 Excerpt: ...field alone. Now, suppose we have'iwo bar magnets, A and B, of equal length, whose pole strengths are to be compared. Place A on the line marked out, with its north polo pointing towards the south pole of the needle; the field of the magnet is then added to the earth's field H, and the needle oscillates quicker, say 40 per minute.-We have here two fields superposed in the same direction in the region of the needle, each field being proportional to the square of the oscillations in a given time. The earth's field is then proportional to 202, and the two fields together proportional to 402; therefore the field produced by the poles of the bar magnet in the region of the needle is proportional to the difference of these squares = 402-202. Now remove A altogether, place B in exactly the same position, and count the oscillations, say 30 per minute. In a similar manner the field in the region of the needle due to the poles of B is proportional to 302-202. Now, referring to Fig. 69a, it has been shown (para. 109) that the intensity of field duo to the poles of a bar magnet at any point p on a line passing through the two poles, distant from the nearer pole say r centimetres, and from the further pole say R centimetres, is equal to where m is the strength of one pole of the magnet. Now, the centre of the vibrating needle being at the point p the oscillations take place under the action of the above field. The is constant for all bar magnets of equal length placed in the same position each time oscillations are observed, and hence the magnetic fields of the two magnets A and B at the centre of the vibrating needle are proportional to their respective pole strengths, and also to the square of the number of oscillations in a given time. Hence we have pole strength of ...


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Product Details
  • ISBN-13: 9781232241089
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1232241083
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 154 gr

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