1.
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A wire carrying an unknown current out of the page is shown above. Determine the current by click-dragging inside the animation to measure the magnetic field. You may also double-click in the animation to create a field line. Assume that the distance shown is in cm and B is shown in milli Tesla. Start
Interactive Hint More Help
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| 28 A. |
| 42 A. |
| 56 A. |
| 112A. |
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2.
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A cross section of three wires carrying unknown currents is shown above. You can click-drag the wires and the black arrow represents the force experienced by each wire. Which wires have a current that points out of the page? Start
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| None of the wires. |
| Wire 2. |
| Wires 1 and 3. |
| All of the wires. |
| Undetermined, insufficient information. |
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3.
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A cross section of three wires carrying unknown currents is shown above. You can click-drag the wires and the black arrow represents the force experienced by each wire. How many wires have like current? Start
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| None of the wires. |
| One wire. |
| Two wires. |
| All of the wires. |
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4.
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Five wires are carrying unknown currents into or out of the plane of the simulation as shown above. You can click-drag the wires and the black arrow represents the force experienced by each wire. How many wires are carrying current in the same direction as the red wire? Start
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| Three wires carry current in the same direction as the red wire. |
| One wire carries current in the same direction as the red wire. |
| All the wires carry current in the same direction. |
| Insufficient information. The direction of the red wire's current flow must be given. |
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5.
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A cross section of three wires carrying unknown currents is shown above. Which wires have equal and opposite current? You can double-click anywhere inside the animation to draw a magnetic field line. You can also click-drag the wires but this will erase any field line that you have drawn. Start
Interactive Hint More Help
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| None of the wires. |
| Wire 1 and Wire 3. |
| Wire 2 and Wire 3. |
| All of the wires. |
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6.
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A magnetic field is shown in the animation along with a loop (the position is given in meters and the magnetic field in milli Tesla). Calculate the integral,  , for the given counter-clockwise path and the given magnetic field. Start
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| 8.4x10-3 Tesla m. |
| 0. |
| 5.6x10-3 Tesla m.
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| The integral cannot be determined. Insufficient information. No symmetry. |
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7.
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A magnetic field is shown in the animation along with a loop (the position is given in meters and the magnetic field in milli Tesla). Calculate the integral,  , for the given counter-clockwise path and the given magnetic field. Start
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| 2x10-3 Tesla m. |
| 0. |
| 12x10-3 Tesla m.
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| The integral cannot be determined. Insufficient information. No symmetry. |
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8.
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A magnetic field is shown in the animation along with a loop (the position is given in meters and the magnetic field in milli Tesla). Calculate the integral, , for the given counter-clockwise path and the given magnetic field. Start
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| 12x10-3 Tesla m. |
| 0. |
| 12x10-3 Tesla m. |
| The integral cannot be determined. Insufficient information. No symmetry. |
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9.
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Four wires with various currents are shown in the animation (position is given in meters and the integral is given in 10-10 Tesla-meters). Also shown is a choice of two detectors that displays the integral, . Choose a detector then drag the Amperian loop and observe readings. Rank the currents from smallest to greatest?
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| All of the currents are alike. |
| 4, 1/3(tie), 2. |
| 2, 1/3(tie), 4.
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10.
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Two wires with current flowing through them perpendicular to the page are shown (position is given in meters and the integral is given in 10-10 Tesla-meters). Also shown is a choice of two detectors that displays the integral, . Choose a detector and observe readings. You may drag a detector from its original position if you wish.. Use your reading(s) and Ampere's law to determine the magnetic field at any point on the surface of the detectors.
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| 0.
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| The magnetic field cannot be determined. Insufficient information. No symmetry. |
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11.
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A wire with current flowing through it perpendicular to the page is shown (position is given in meters and the integral is given in 10-10 Tesla-meters). Also shown is a choice of two detectors that displays the integral, . Choose a detector and observe readings. You may drag a detector from its original position if you wish.. Use your reading(s) and Ampere's law to determine the current flowing through the wire. Interactive Hint Read the magnetic field at any point in the animation by a mouse-down. Enable B Field See Giancoli-SE: 28-5.
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| 0 A.
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| The magnetic field cannot be determined. Insufficient information. No symmetry. |
| Cannot use Detector A, -1.0mA from Detector B. |
| Cannot use Detector A, 1.0mA from Detector B. |
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12.
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The above animations represent solenoids, a long coil of wire consisting of numerous loops. You may double- click anywhere inside the animation to add a magnetic field line and you may click-drag anywhere to measure the magnetic field strength at that point. Which animation most correctly depicts a solenoid where you may use Ampere's law to measure the magnetic field inside the solenoid?
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| Animation 1. |
| Animation 2. |
| Animation 3. |
| Animation 4. |
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13.
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How many loops are necessary to create a solenoid with a uniform magnetic field? Build a solenoid by adding current loops to the simulation and then determine the current flowing inside a loop by measuring the magnetic field inside the solenoid. You can measure the magnetic field by click-dragging the mouse and observing the yellow message box. The field is measured in micro Tesla, mT, and distance is measured in meters. You can also superimpose field lines by double-clicking inside the animation.
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| 4.7 A |
| 5.4 A |
| 9.4 A |
| 10.8 A |
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14.
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A cross-section of a circular wire loop carrying a current is shown above (position given in centimeters and magnetic field given in milli-Tesla). You can click-drag to read the magnitude of the magnetic field. What is the current in the loop? Start
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| 15 A. |
| 30 A. |
| 60 A. |
| 0.3 A. |
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15.
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A cross-section of a two circular wire loops carrying the exact same current is shown above (position given in centimeters and magnetic field given in milli-Tesla). You can click-drag to read the magnitude of the magnetic field. What is the current in each loop? Start
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| 24 A |
| 6 A. |
| 12 A |
| 60 A |
