Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    438/502 page 418
    CHAP. X In order to prove these laws experimentally Ampere devised the arrangement shown in Fig. 130(2'. It is known as Amperes stand. Two brass pillars are fixed to a stand and carry two horizontal brass arms having at their ends two cups x and y containing mercury. A conducting wire in the form of a rectangle is supported by its ends in the two cups so that it is freely movable and yet when the pillars are connected with the poles of a battery a current may be sent through the rectangle. By bringing near one of the vertical sides a straight wire also conveying a current, the Laws I and II may be readily proved. III. When two currents cross at a point they attract each other, if they both tend either towards the point or from it ; but they repel one another when they tend in contrary directions. In Fig. 131 we have the various cases of Law III. In the two right-hand figures we see that the currents are moving in the same direction, either to or from the angle, and hence
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