1.
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The above animations represent a typical bar magnet with a North and South pole. You may double click anywhere inside the animation to add a magnetic field line. Which animation correctly depicts a properly labeled magnet?
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| Animation 1. |
| Animation 2. |
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2.
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The above animations represent two typical bar magnets each with a North and South pole. The arrows represent the direction of the magnetic field. The color of the arrows represents the magnitude of the field with magnitude increasing as the color changes from blue to green to red to black. You may drag either magnet and double-click anywhere inside the animation to add a magnetic field line, and mouse-down to read the magnitude of the magnetic field at that point. Which animation correctly depicts a properly labeled magnets?
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| Animation 1. |
| Animation 2. |
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3.
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The above animations represent two typical bar magnets each with a North and South pole. You may drag either magnet, double-click anywhere inside the animation to add a magnetic field line, and mouse-down to read the magnitude of the magnetic field at that point. Which animation correctly depicts a properly labeled magnets?
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| Animation 1. |
| Animation 2. |
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4.
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A cross-section of a circular wire loop carrying an unknown current is shown above. The arrows represent the direction of the magnetic field. The color of the arrows represents the magnitude of the field with magnitude increasing as the color changes from blue to green to red to black. You can double-click in the animation to add magnetic field lines, click-drag the center of the loop to reposition it, and click-drag the top or bottom of the loop to change its size. Does current flow out of the red end or the blue end? Start
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| Blue represents current flowing out of the plane of the simulation. |
| Red represents current flowing out of the plane of the simulation. |
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5.
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A cross section of three wires carrying unknown currents is shown above. Which wires are carrying current out of the plane of the simulation, that is, out of the computer monitor? 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
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| None of the wires. |
| Wire 2. |
| Wire 1 and Wire 3. |
| All of the wires. |
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6.
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The above animations represent two typical bar magnets each with a North and South pole. The arrows represent the direction of the magnetic field. A wire is placed between the magnets and a current that comes out of the page can be turned on. Which animation properly represents the deflection of the wire when the current is on? Start Animation
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| Animation 1. |
| Animation 2. |
| Animation 3. |
| Animation 4. |
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7.
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A wire carrying an unknown current is shown above. An external magnetic field that has constant magnitude and direction is applied to the top half of the simulation (The gray rectangle is at the boundary for your reference). In addition, there is the magnetic field produced by the current in the wire. The direction arrows show the vector sum of these two fields. (The color of the direction arrows represents the magnitude of the field as before.) Find the current in the wire by click-dragging the wire into the external field if the external field has a magnitude of 2 Tesla. Observe the force vector and the force/length in the yellow message box in the lower left hand corner. Start
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| 1.0 A out of the plane of the simulation. |
| 1.5 A out of the plane of the simulation. |
| -1.0 A into the plane of the simulation. |
| -1.5 A into the plane of the simulation. |
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8.
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An unknown charged particle is fired into an apparatus with a controllable magnetic field. The animation shows a top view of the apparatus with the green arrow representing the velocity and the blue arrow the force. The magnetic field points into or out-of the plane of the view depending on the sign of Bz. That is, the z axis is directed out of the computer monitor. Enter a field value with magnitude less than 5, Bz= milli-Tesla and press the play button whenever you wish to change the field. Observe the force vector on the particle. Determine the charge to mass ratio of the particle by studying the dynamics. Time is measured in seconds and distance in cm. Start
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| 2 x 105 Coul/Kg. |
| 3 x 105 Coul/Kg. |
| 4 x 105 Coul/Kg. |
| 5 x 105 Coul/Kg. |
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9.
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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. |
| None of the wires. |
| Undetermined, insufficient information. |
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10.
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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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11.
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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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12.
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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. |
