E2_Magnetic Induction of a Current-Carrying Long

E2_Magnetic Induction of a Current-Carrying Long - E2...

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Unformatted text preview: E2 Magnetic Induction of a Current-Carrying Long Straight Wire 1 NANYANG TECHNOLOGICAL UNIVERSITY First Year Common Engineering Course Laboratory Formal Report for Experiment E2 Magnetic Induction of a Current-Carrying Long Straight Wire First Year Laboratory B (S2-B4a-01) Name : Ding Zejun Group : BL11 Submitted Date : 20 th , Feb, 2007 E2 Magnetic Induction of a Current-Carrying Long Straight Wire 2 Content I. Introduction II. Objectives III. Equipment IV. Theory V. Experimental Procedure VI. Results and Discussion VII. Conclusion VIII. Reference IX. Appendix E2 Magnetic Induction of a Current-Carrying Long Straight Wire 3 I. Introduction Magnetic fields are produced by moving electric charges. Current existing in an infinitely long straight wire will produce a magnetic field B in the region surrounding it. When the current is constant in time, the existing B field will also be constant in time at a given point. Moreover, by using a small compass, the presence of the constant B field can be detected. On the other hand, when the current in the wire varies with time, the produced B field will be time-varying as well. Since changing magnetic field induces electric field, by measuring the voltage of a small inductor coil placed near the wire, the time-varying B field can be detected. II. Objectives In this laboratory, we will accomplish the following objects by the measurements on an apparatus with a long straight current-carrying: i. Determining the direction of the B field surrounding the long straight wire by using a compass. ii. Confirming that the direction of the B field near the wire is consistent with the right-hand rule which relates the current direction to the direction of the B field. iii. Determining the induced voltage in a small inductor coil placed near a long straight wire is a relative measurement of the B field. iv. Demonstrating that the magnitude of the B field surrounding a long straight wire decreases with increasing r, where r is the perpendicular distance from the wire. v. Determining the induced voltage in a small inductor coil as a function of the ac current in a long straight wire. vi. Determining the induced voltage in a small inductor coil as a function of the frequency of the ac current in a long straight wire. III. Equipment Fig. 1: Long-wire apparatus experimental setup E2 Magnetic Induction of a Current-Carrying Long Straight Wire 4 i. Direct-current power supply. To produce constant current in the straight wire. ii. Sine-wave generator. To generate alternative current. iii. Digital voltmeter. To measure the voltage across the inductor coil. iv. Digital ammeter. To measure the current in the long wire apparatus. v. A 100-mH inductor coil (length 1 cm and inside diameter 0.5 cm). The electric field induced in it indicates the varying B field near the straight current- carrying wire....
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E2_Magnetic Induction of a Current-Carrying Long - E2...

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