Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . er it. The iron filings arrangethemselves circularlyaround the wire. Nearthe centre of the loop thefilings are nearly parallelwith its axis. Explorethe field inside and out Made with the aid of iron filings. wjtJ1 a compaSS needle J the needle at any point lies in the direction of the filings atthis point, and its N-pole points in the direction of the cur-rents field. The arrows in Fig. 139 indicate the direction ofthe whirls, and the several positions of the needle. Apply the right-
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . er it. The iron filings arrangethemselves circularlyaround the wire. Nearthe centre of the loop thefilings are nearly parallelwith its axis. Explorethe field inside and out Made with the aid of iron filings. wjtJ1 a compaSS needle J the needle at any point lies in the direction of the filings atthis point, and its N-pole points in the direction of the cur-rents field. The arrows in Fig. 139 indicate the direction ofthe whirls, and the several positions of the needle. Apply the right-hand test, ^[ 170, and it will confirm theposition the needles take up at any point. On one side of theloop all the whirls enter it in the same direction, and emergefrom the opposite side as is further shown in Fig. 140. 172. Magnetic Field at the Centre of a Circular Cur-rent.—If a magnetic body, A, Fig. 140, be held above thecircular loop, through which a current is flowing, it will tendto move downward through the loop, with its axis coincidingwith the axis of the loop, until its position accommodates.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
