MFF6A-CRT2: STRAIGHT CURRENT-CARRYING WIRE
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1 MFF6A-CRT2: STRAIGHT CURRENT-CARRYING WIRE Shown below is the graph of the magnetic field due to a current in a long straight wire. The magnetic field is measured at some point. B (in 10-5 T) I (in A) Setup an appropriate equation that would give the distance r that point is from the current-carrying straight wire. 27 of 27 MFF6a 6_08_02
2 MFF6A-CRT1: STRAIGHT CURRENT-CARRYING WIRE The equation below represents the magnetic field at a particular point due to a currentcarrying long, straight wire T= 7 ( 4 10 m T / A)( 2. 50A) m ( ) Draw an appropriate diagram of the current-carrying wire and magnetic field represented by this equation. 26 of 27 MFF6a 6_08_02
3 MFF6A-BCT2: STRAIGHT CURRENT-CARRYING WIRE The figure below shows a current-carrying long, straight wire conducting current in the +xdirection. oint is located a distance r away from the wire. I Represent on the bar chart below the magnitude of the magnetic field at point if the current in the wire can change. The current in the wire is indicated above each bar chart, and the bar chart for in the figure is given. I 2I I/2 3I -I Explain the reasoning behind your bar charts: 25 of 27 MFF6a 6_08_02
4 MFF6A-BCT1: STRAIGHT CURRENT-CARRYING WIRE The figure below shows a current-carrying long, straight wire conducting current in the +xdirection. B A C D Wire Current i E Represent on the bar chart below, the magnitude of the magnetic field at the various points shown in the diagram above given the magnitude at point A. B A C D Wire Current i E Explain the reasoning behind your bar charts: 24 of 27 MFF6a 6_08_02
5 MFF6A-QRT2: STRAIGHT CURRENT-CARRYING WIRE The figure below shows the magnetic field due to a current-carrying long, straight wire. B What is the direction of the current in the wire? If we reversed the direction of the current, what would happen to the direction of the magnetic field generated by the wire? If we increase the current flowing in the wire, what will happen to the strength of the generated magnetic field? Describe the strength of the magnetic field as a function of the distance from the wire. 23 of 27 MFF6a 6_08_02
6 MFF6A-QRT1: STRAIGHT CURRENT-CARRYING WIRE The figure below shows a point near a current-carrying long, straight wire. oint and the wire lie in the plane of the paper. I What is the direction of the magnetic field due to the current-carrying wire at point? What would happen to the direction of the magnetic field at point if the current in the wire was reversed? What would happen to the magnetic field at point if the current in the wire was increased? What would happen to the magnetic field at point if the current in the wire was decreased? What would happen to the magnetic field at if point was moved farther away from the wire? What would happen to the magnetic field at if point was moved closer to the wire? 22 of 27 MFF6a 6_08_02
7 MFF6A-M/MCT1: STRAIGHT CURRENT-CARRYING WIRE The figure below shows a long, straight wire conducting a 10 A current. oint is 0.05 m from the wire. I Given below is a student's calculation for the magnetic field generated by the current-carrying, long straight wire. r -7 ( 4 10 m T / A)( 10A) B= kˆ 2 (. 05m) Is this calculation meaningful (i.e., it tells us something legitimate about this situation) or is it meaningless (i.e., the value calculated is either nonsense, or it tells us nothing legitimate about this situation)? 21 of 27 MFF6a 6_08_02
8 MFF6A-ET2: STRAIGHT CURRENT-CARRYING WIRE A current-carrying long, straight wire is conducting current out of the paper. The current direction is reversed. What will happen to the magnetic field generated by the current-carrying wire? Explain fully. 20 of 27 MFF6a 6_08_02
9 MFF6A-ET1: STRAIGHT CURRENT-CARRYING WIRE A current-carrying long, straight wire is initially conducting current towards the east. The current is reversed. What will happen to the magnetic field generated by the current-carrying wire? Explain fully. 19 of 27 MFF6a 6_08_02
10 MFF6A-LMCT1: STRAIGHT CURRENT-CARRYING WIRE As shown in the figure below, a current-carrying long, straight wire is conducting current to the right. oint is located above the wire as shown. I A number of changes in this situation will be described below. For each change, you are to identify how the change will affect, if it will, the magnetic field generated by the currentcarrying wire at point. The possible answers are: A. this change will only alter the direction of the magnetic field generated by the wire. B. this change will only increase the magnitude of the magnetic field generated by the wire. C. this change will only decrease the magnitude of the magnetic field generated by the wire. D. this change will alter both the magnitude and direction of the magnetic field generated by the wire. E. this change will not affect the magnetic field generated by the wire. Each change below refers to the original situation stated above: The current in the wire is replaced by a larger current. The direction of the current in the wire is reversed. The current in the wire is reduced to zero. The current in the wire is replaced by a smaller current. oint is moved closer to the current-carrying wire. oint is moved further away from the current-carrying wire. oint is moved the same distance below the wire. 18 of 27 MFF6a 6_08_02
11 MFF6A-TT3: STRAIGHT CURRENT-CARRYING WIRE As shown in the figure below, a current-carrying long straight wire is conducting current out of the paper (indicated by the ). Concentric circles in the clockwise direction indicate the magnetic field generated by this current-carrying wire. There is at least one error in the diagram and/or statement above. Identify the error(s) and explain how to correct it (them). 17 of 27 MFF6a 6_08_02
12 MFF6A-TT2: STRAIGHT CURRENT-CARRYING WIRE As shown in the figure below, a current-carrying long, straight wire is conducting current to the right. The magnetic field generated by the current in the wire is uniform and into the paper. B I There is at least one error in the diagram and/or statement above. Identify the error(s) and explain how to correct it (them). 16 of 27 MFF6a 6_08_02
13 MFF6A-TT1: STRAIGHT CURRENT-CARRYING WIRE There is at least one error in the statement below. Identify the error(s) and explain how to correct it (them). A current-carrying long, straight wire is conducting current in the + x-direction. The direction of the magnetic field generated must be out of the x-y plane everywhere in the region of the wire. 15 of 27 MFF6a 6_08_02
14 MFF6A-WWT3: STRAIGHT CURRENT-CARRYING WIRE What, if anything, is wrong with the following statement? If something is wrong, explain the error and how to correct it. If the statement is legitimate as it stands, explain why it is valid. A long, straight wire is conducting current whose direction is pointed out of the paper towards you. The magnetic field generated by this wire is into the paper to the right of the wire and out of the paper to the left of the wire. 14 of 27 MFF6a 6_08_02
15 MFF6A-WWT2: STRAIGHT CURRENT-CARRYING WIRE A long, straight wire is conducting current whose direction is pointing out of the paper towards you. The magnetic field generated by this wire may be represented by concentric circular loops (with the wire being the center of the circle) in the clockwise direction. What, if anything, is wrong with the above statement about this situation? If something is wrong, explain the error and how to correct it. If the statement is legitimate as it stands explain why it is valid. 13 of 27 MFF6a 6_08_02
16 MFF6A-WWT1: STRAIGHT CURRENT-CARRYING WIRE A long, straight wire is conducting current whose direction is pointing out of the paper towards you. The magnetic field generated by this wire may be represented by concentric circular loops (with the wire being the center of the circle) evenly separated from the wire. What, if anything, is wrong with the above statement about this situation? If something is wrong, explain the error and how to correct it. If the statement is legitimate as it stands explain why it is valid. 12 of 27 MFF6a 6_08_02
17 MFF6A-CCT2: STRAIGHT CURRENT-CARRYING WIRE Consider the following statements made by three students. Student I: For a current-carrying long, straight wire, the magnetic field generated looks like the magnetic field generated around a bar magnet. Student II: For a current-carrying long, straight wire, the magnetic field generated looks like circular loops around the wire with the wire as the center of the loops. Student III: For a current-carrying long, straight wire, the magnetic field generated looks like straight lines sticking out of the wire. Which, if any, of these three students do you believe is correct? Explain fully why you chose as you did. 11 of 27 MFF6a 6_08_02
18 MFF6A-CCT1: STRAIGHT CURRENT-CARRYING WIRE Consider the following statements made by three students. Student I: For a long, straight wire to create a magnetic field, it only needs to have current flowing in the wire. Student II: For a long, straight wire to create a magnetic field, it will create a magnetic field if it has a net charge. Student III: A long, straight wire cannot create a magnetic field by itself. Which, if any, of these three students do you believe is correct? Explain fully why you chose as you did. 10 of 27 MFF6a 6_08_02
19 MFF6A-WBT3: STRAIGHT CURRENT-CARRYING WIRE Draw and describe a physical arrangement to which the equation below could apply. ( ) ( ) m T 7. 50A= m T / A 9 of 27 MFF6a 6_08_02
20 MFF6A-WBT2: STRAIGHT CURRENT-CARRYING WIRE Draw and describe a physical arrangement to which the equation below could apply m= 7 ( 4 10 m T / A)( 10A) T ( ) 8 of 27 MFF6a 6_08_02
21 MFF6A-WBT1: STRAIGHT CURRENT-CARRYING WIRE Draw and describe a physical arrangement to which the equation below could apply T= 7 ( 4 10 m T / A)( 2. 50A) m ( ) 7 of 27 MFF6a 6_08_02
22 MFF6A-RT4: STRAIGHT CURRENT-CARRYING WIRE The figures below show current-carrying, long straight wires. The current in the wire is given. Also shown are various charges at rest at specific distances from the wire. Rank these situations from greatest to least on the basis of the strength (magnitude) of the magnetic field at the location of these charges. 3A +2q 2 cm 2A 3 cm 1 cm +q A B -q 1A C -2q -q 1A 2 cm 2A +q 1 cm 3A 3 cm D E F Greatest Least Or, the field is the same for all six situations. Or, the ranking for the fields cannot be determined. lease carefully explain your reasoning. How sure were you of your ranking? (circle one) Basically Guessed Sure Very Sure of 27 MFF6a 6_08_02
23 MFF6A-RT3: STRAIGHT CURRENT-CARRYING WIRE The figures below show current-carrying, long straight wires. The current in the wire is given. Also shown are various charges at rest at specific distances from the wire. Rank these situations from greatest to least on the basis of the strength (magnitude) of the magnetic field at the location of these charges. 3A +2q 2 cm 2A -q 3 cm 1A +q 1 cm A B C 1A -2q 2 cm 2A +q 1 cm 3A -q 3 cm D E F Greatest Least Or, the field is the same for all six situations. Or, the ranking for the fields cannot be determined. lease carefully explain your reasoning. How sure were you of your ranking? (circle one) Basically Guessed Sure Very Sure of 27 MFF6a 6_08_02
24 MFF6A-RT2: STRAIGHT CURRENT-CARRYING WIRE The figures below show current-carrying, long straight wires. The current in the wire is given. Also given is a point in space,, and its distance from the wire. Rank these situations from greatest to least on the basis of the strength (magnitude) of the magnetic field at point. 3A 2 cm 2A 3 cm 1A 1 cm A B C 1A 2 cm 2A 1 cm 3A 3 cm D E F Greatest Least Or, the field is the same for all six situations. Or, the ranking for the fields cannot be determined. lease carefully explain your reasoning. How sure were you of your ranking? (circle one) Basically Guessed Sure Very Sure of 27 MFF6a 6_08_02
25 MFF6A-RT1: STRAIGHT CURRENT-CARRYING WIRE The figures below show identical current-carrying, long straight wires. The current in the wire is given. Also given is a point in space,, and its distance from the wire. Rank these situations from greatest to least on the basis of the strength (magnitude) of the magnetic field at point. 3A 2 cm 2A 3 cm 1A 1 cm A B C 1A 2 cm 2A 1 cm 3A 3 cm D E F Greatest Least Or, the field is the same for all six situations. Or, the ranking for the fields cannot be determined. lease carefully explain your reasoning. How sure were you of your ranking? (circle one) Basically Guessed Sure Very Sure of 27 MFF6a 6_08_02
26 MFF 6A: STRAIGHT CURRENT-CARRYING WIRE 2 of 27 MFF6a 6_08_02
27 MFF 6a: Straight Current-Carrying Wire... 2 MFF6a-RT1: Straight Current-Carrying Wire... 3 MFF6a-RT2: Straight Current-Carrying Wire... 4 MFF6a-RT3: Straight Current-Carrying Wire... 5 MFF6a-RT4: Straight Current-Carrying Wire... 6 MFF6a-WBT1: Straight Current-Carrying Wire... 7 MFF6a-WBT2: Straight Current-Carrying Wire... 8 MFF6a-WBT3: Straight Current-Carrying Wire... 9 MFF6a-CCT1: Straight Current-Carrying Wire MFF6a-CCT2: Straight Current-Carrying Wire MFF6a-WWT1: Straight Current-Carrying Wire MFF6a-WWT2: Straight Current-Carrying Wire MFF6a-WWT3: Straight Current-Carrying Wire MFF6a-TT1: Straight Current-Carrying Wire MFF6a-TT2: Straight Current-Carrying Wire MFF6a-TT3: Straight Current-Carrying Wire MFF6a-LMCT1: Straight Current-Carrying Wire MFF6a-ET1: Straight Current-Carrying Wire MFF6a-ET2: Straight Current-Carrying Wire MFF6a-M/MCT1: Straight Current-Carrying Wire MFF6a-QRT1: Straight Current-Carrying Wire MFF6a-QRT2: Straight Current-Carrying Wire MFF6a-BCT1: Straight Current-Carrying Wire MFF6a-BCT2: Straight Current-Carrying Wire MFF6a-CRT1: Straight Current-Carrying Wire MFF6a-CRT2: Straight Current-Carrying Wire of 27 MFF6a 6_08_02
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