Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ons increases the extent of theneedles deflection till it assumes a position at right angles tothe wire when the current is sufficiently strong. With the ELECTR OMA GNETISM. 159 current reversed in the above condition, the N-end of theneedle is deflected west. (Compare B and C with F, Fig. 135.)The current flowing in opposite directions, above and below theneedle, increases the amount of deflection. Equal currentsflowing above and below the needle, in the same direction,produce no de
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . ons increases the extent of theneedles deflection till it assumes a position at right angles tothe wire when the current is sufficiently strong. With the ELECTR OMA GNETISM. 159 current reversed in the above condition, the N-end of theneedle is deflected west. (Compare B and C with F, Fig. 135.)The current flowing in opposite directions, above and below theneedle, increases the amount of deflection. Equal currentsflowing above and below the needle, in the same direction,produce no deflection. (G, Fig. 135.) If two unequal cur-rents flow, one above and the other below the needle, theneedle obeys the directive force of the stronger current. Exp. 51: A simple form of apparatus forstudying the relation between a needledeflection and the direction of currentcalled an Oersted stand, is shown in It consists of two parallel brass rodsprovided with binding posts and supportedfrom a wooden base. With it the studentshould verify all the cases given in and make notebook Fig. 137.—Oersted Standfor Studying the Nee-dles Deflectionsby a Current. 169. Right-Hand Rule for Direc-tion of Whirls.—If the Directionof Current in any Circuit is Known,the Direction of the Circular Magnetic Field Around theWire May be Found as Follows: Place the palm of the outstretched right hand above the wire,with the fingers pointing in the direction of the current, and the outstretched thumb ex-tended at right anglesand underneaththe wire. (See righthand, Fig. 134.)The direction inivhich the thumbpoints will indicatethe direction of thecircular field aroundthe wire.
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