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Example research essay topic: B C D Opposite Direction - 1,234 words

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... cases to be considered: (1) north inserted, (2) north withdrawn, (3) south inserted, and (4) south withdrawn. For each case there are four pictures. Therefore, a total of 16 diagrams are required.

The direction the galvanometer needle moves is the same direction as the current is flowing. Remember the bar magnet has a field running from N to S. When this is inserted in the coil, a current is set up in order to produce a magnetic field that will cancel out the field of the bar magnet. Is the field produced by the current in the coil in the right direction to cancel the field of the bar magnet? 2. Repeat part 1, but much more slowly than before. Compare results.

Does the speed have an effect on the strength of the magnetic field produced? 3. Repeat the procedure with the other end of the magnet. III. Currents Induced by Current- Carrying Coils: 1. Connect a second coil t the 1. 5 v power supply oriented as shown. Quickly move coil A up to coil B, maintaining orientation shown above (note effects).

Indicate the current in each coil. Quickly move coil A away from B. Indicate the directions of the currents in the coils. Remember current flows from to and is set in coil A.

Does coil A behave exactly like the bar magnet did? 2. Now disconnect one wire from coil A and move coil A up to coil B. Reconnect the wire to coil A (note effect), disconnect wire (note effect). Indicate direction of currents in coils for each case. A B V Data: I. 1.

The magnetic field of a straight wire was found to be: 2. The magnetic field of the same wire with current in opposite direction: 3. The magnetic fields of loops of wire with current in opposite directions: a. b. 4. The mapped magnetic field from a loop attached to a voltage: a. b.

II. 1. The diagrams indicating the insertion of the north pole of a bar magnet into the coil: a. b. c. d. The diagram with the south pole of the bar magnet being inserted into the coil: a.

b. c. d. The diagram of the north pole of the bar magnet being withdrawn form the coil: a. b. c.

d. The diagram for the south- pole of the bar magnet being withdrawn from the coil: e. f. g. h. III. 1.

Diagrams for current- carrying coils being moved together: a. b. 2. Diagrams for coils being placed together with a wire detached from coil A and then replaced and removed after being positioned in close proximity: a. b. 3. Diagrams for the insertion of a soft iron rod (nail) through the two coils with circuit suddenly closed: a. b.

c. d. These are for the closing circuit with the current in the powered coil flowing in the opposite direction: a. b. c. d.

These diagrams are for the situation of breaking the circuit with a soft iron rod inserted through the coils: a. b. c. d. These diagrams are for the breaking of the circuit with the current flowing in the opposite direction from the previous circuit: a. b.

c. d. Results: The results of this laboratory are not represented as calculations. The diagrams in the previous section constitutes a large portion of the answers to the questions and assignments within the procedure. Most of the questions are represented in the previous section and those questions requiring a verbal answer are fulfilled in this section. The first question from the second part of the Procedure section asks for observations of the swift insertion of the bar magnet into the coil.

The galvanometer needle moves into position and then settles back to neutral after the magnet stops. The next question, also in that section, asks if the field produced by the current in the coil was in the opposite direction of the magnetic field of the bar magnet? The field produced is bound by physical law to be in the opposite direction of the field of the bar magnet. The field acts to cancel the effect of the magnets field on the coil. The next question asks if the speed of the inserted magnet has any effect on the strength of the magnetic field produced. The answer is yes; the field produced in the coil is weaker as the magnet is inserted and withdrawn at a slower pace.

The final question of the laboratory, from the third section of the procedure, asks if the coil attached to the power supply acts like the bar magnet did when moved close to another coil. The answer is yes; the powered coil has a magnetic field due to the current passing through it. When placed near the other coil at some rate of speed, the galvanometer attached to the second coil reacts to the current being produced in the coil. Percentage Error Difference: This laboratory does not involve any numerical calculations to be compared to theoretical values. Due to this fact, there is no percentage error difference found in the course of these experiments. That said, any error in the reporting of the results and data of this lab would be the result of human error.

Any wrongful interpretations or misappropriation of the experimental situations would be attributed to the student. This is the only source of error in this laboratory. Conclusion; The laboratory results were very clear. The equipment was used in its proper manner and subsequently produced accurate results. The mapping of the magnetic fields around the current- carrying straight and looped wires were found to be consistent with the instruction provided in the textbook. The change in direction of the current produced to appropriate resulting magnetic field as compared to the text.

The bar magnet and coil section of the laboratory allowed for a close comparison with the theory behind electromagnetic induction. As the magnet was inserted into the coil, the galvanometer needle registered a current. The direction of the resulting field could then be produced with guidance from the theory and a little deductive reasoning. The final section of the procedure also held to the predictions of theory. The idea that a powered coil would act like a bar magnet when moved into close proximity with a coil attached to a galvanometer also proved to be true.

The galvanometer reacted in the same way as if the magnet were being inserted into the coil. The powered coil has a magnetic field of its own due to the current in the wire. As a result of this field, the galvanometer detects a current in the coil attached to it exactly like the situations involving a bar magnet. The results of this laboratory indicates a successful representation of the basic theoretical guidelines. The equipment was satisfactory for the tasks described in the procedure and the results were equally as satisfying. With this success, the student sees the theory in a tangible form and this would help to cement the concepts of electromagnetic induction in their memory.

Works Cited: 1. Cutnell, John D. and Johnson, Kenneth W. Physics. 3 rd ed. John Wiley & Sons, inc. , New York, 1995 2. Ohanian, Hans C.

Physics. 2 nd ed. W. W. Norton & Company, New York, 1989. 3. Serial, Raymond A and Fought, Jerry S. College Physics. 5 th ed.

Saunders College Publishing, Orlando, 1999.


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