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LAB 223

# LAB 223 - multimeter C p vo R 27.8 800...

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LAB 223 Mehar Ghei LABORATORY EXPERIMENT REPORT Name: Mehar Ghei Group Members: Yvonne Chen, Marvin Castellon, Jeremy Buhain Experiment Date: Thursday, April Course Name: PHYS 121A Section: H02 Instructor: Beidi He LABORATORY #223 Faraday’s Law 1. OBJECTIVE To measure the voltage induced in a coil by a changing magnetic field and compare it with the predicted value by Faraday’s law. 2. THEORETICAL BACKGROUND = * ϕ B dA =- ε dϕdt =- ε NAdBdt = ( ) Bt B0sin ωt =- ( ) ( ) ε NA 2πf B0cos ωt 3. EQUIPMENT a. Optical bench with bench clamps b. Pair of Helmholtz on holders c. Detecting coil d. Two digital multimeters e. Vernier magnetic field sensor f. AC differenctial voltage probe g. Function generator with 1 cable h. Senco stands i. Magnetic compass j. Banana cables k. DC power supply 4. COLLECTED DATA Page 1 of 2

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LAB 223 Mehar Ghei R= 3.5x10 .2 m N=320 turns Helmholtz Coil Current (mA) Frequency (Hz) Magnetic Field Bo from curve (mT) Theoretical peak EMF computed from equation (6) Experimental value of peak coil EMP measured by the computer RMS coil voltage from
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Unformatted text preview: multimeter C p vo R 27.8 800 1.825837 .618085 .664777 0.459 27.8 400 2.68677 .45477 .3065 0.225 27.8 200 2.84043 .24039 .154464 0.111 27.8 100 3.611181 .015281 .079321 .057 27.8 50 3.679426 .07784916 .0041 .031 5. CALCULATIONS (On separate sheet) 6. DISCUSSION Out percent error ranges to about 10% to 20% in comparison from our experimental values to theoretical. The main source of error is incorrect set-up. The lab manual was not specific enough on teaching us how to set up the connections, which would have sent the voltage elsewhere, changing the values. The RMS method is the best method to use in this situation because it gives the closest values. The percent error between slopes is about 28% of the plots of the theoretical and experimental values. 7. CONCLUSION We measured the voltage induced in a coil by a changing magnetic field and compared it with the predicted value by Faradays law. Page 2 of 2...
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LAB 223 - multimeter C p vo R 27.8 800...

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