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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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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| 5 m/s. |
| 5.2 m/s. |
| 5.4 m/s. |
| 5.6 m/s. |
