. Laboratory exercises in elementary physics. NT ELECTRICITY. rent generated by the cell under test that will pass througha resistance is measured and compared with the amountthat passes when a standard cell is used. Questions.—1. Which gives the greater E. M. F., car-bon and zinc, or iron and zinc ? 2. What E. M. F. is pro-duced by two like plates ? 3. What seems to determinethe E. M. F. in a galvanic cell? EXERCISE 10. 1. Apparatus.—Carriage-bolt; 100 cm. No. 18 wire ; cell; compass ;iron-filings ; paper and pencil; current; some means of varyingresistance of the
. Laboratory exercises in elementary physics. NT ELECTRICITY. rent generated by the cell under test that will pass througha resistance is measured and compared with the amountthat passes when a standard cell is used. Questions.—1. Which gives the greater E. M. F., car-bon and zinc, or iron and zinc ? 2. What E. M. F. is pro-duced by two like plates ? 3. What seems to determinethe E. M. F. in a galvanic cell? EXERCISE 10. 1. Apparatus.—Carriage-bolt; 100 cm. No. 18 wire ; cell; compass ;iron-filings ; paper and pencil; current; some means of varyingresistance of the circuit and of reversing the current. Object.—To study the magnetic effects of an electriccurrent and the conditions affecting the strength of anelectro-magnet. Manipulation.—Part I. Hold the carriage-bolt infront of you with the nut away from you and wind aroundit 15 or 20 turns of insulated wire from left to right (if awatch were facing you, the turns would be with the direc-tion of the motion of the hands). Arrange as in Fig. Complete the circuit. Note what happens. Test theother end at the compass. Move the compass along fromone end of the bolt to the other. Note what happens to apiece of soft iron when a wire carrying a current is coiledaround it. Part II. Kepeat Part I with the current reversed. ELECTRO-MAGNETISM. 51 Part III. Kewind the wire in the opposite direction,repeat Part I, and observe the result. Part IV. Eeverse the current, and again repeat. Questions.—1. What is the effect of reversing the cur-rent ? 2. What effect has the direction of the current ?3. What happens when the circuit is broken ? Does theeffect produced by the direction of the current entirelydisappear when the circuit is broken ? EXPERIMENT 2. Object.—To see if an electro - m agnet * resembles anordinary magnet. Manipulation.—Bring the electro-magnet up to someiron-filings, and see if it attracts them. EXPERIMENT 3. Object.—To investigate the conditions affecting thepower o
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