Laboratory manual in physics . to the field. Note theeffect on the voltage by introducing more or lessresistance in the rheostat. Discussion.—The voltage set up in the armature iscaused by the coils of wire on the armature cuttingthe lines of magnetic force passing between the northand south poles of the field magnet. The greaterthe number of lines of force cut per second, the higherthe voltage. Therefore, if we were to increase thenumber of turns of wire on the armature, what effectwould be produced on the voltage? Explain the effect of changing the speed of thearmature. Explain the effect of
Laboratory manual in physics . to the field. Note theeffect on the voltage by introducing more or lessresistance in the rheostat. Discussion.—The voltage set up in the armature iscaused by the coils of wire on the armature cuttingthe lines of magnetic force passing between the northand south poles of the field magnet. The greaterthe number of lines of force cut per second, the higherthe voltage. Therefore, if we were to increase thenumber of turns of wire on the armature, what effectwould be produced on the voltage? Explain the effect of changing the speed of thearmature. Explain the effect of changing the strength of themagnetic field. How would you change the fieldwindings so as to increase the magnetic strength ofthe field? If you wished to construct a dynamo having a veryhigh voltage would ygtu wind the armature withlarge or small wire? Why? Miscellaneous ExperimentsEXPERIMENT G 97 Question.—Why is the image in a plane mirrorreversed ? Apparatus.— Rectangular mirror attached to block;cardboard; pin; Directions.—Write your name on a piece of paper,hold it in front of the mirror and note the imageformed. Is it reversed? Let us locate the imageformed by the mirror of some simple object such as atriangle and see the reason for its being reversed. Draw a straight line through the middle of the card-board and place on it the reflecting or back surface ofthe mirror. In front of the mirror, and to one side asshown in the diagram, draw a triangle, ABC. Theimage of the triangle can be located by locating theimages of its vertices, A, B, and C. Stick a pinvertically in the card-board at A. To the left of thetriangle lay a rule on the card-board and sight alongits edge to the image of the pin. Draw a line to 98 Laboratory Manual in Physics indicate this direction. The image of A must liesomewhere in the line produced. Move the rule toone side and again locate by a line the direction inwhich the image is seen. The intersection of thesetwo lines produced must b
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysics, bookyear1912
