1.
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You are given four force fields through which you are to drag an object. The table and the bar graph show the work associated with moving the charge around from one point to another. Which one(s) of the force fields can be represented by a potential energy function?
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| Fields A, B, and D.
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| Fields A and B. |
| Field C. |
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2.
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A 20 gr charged object is placed in a uniform electrostatic field. When the animation is running the object will begin to move and display its velocity in meters/second. You can use the mouse to grab the charge while the simulation is running and while it is paused. Imagine that you are actually dragging the object as you move the mouse. How much work is done dragging the charge from the blue line to the green line?
start
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| -1.5 J |
| -3 J |
| 1.5 J |
| -1.7 J |
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3.
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The panel on the left displays an electric field plot. The arrows in the field plot represent the direction and the colors represent the magnitude of the electric field. Draw the equipotential lines for this field by dragging the pencil (at its tip) after clicking the "draw on" button. After you have drawn your lines, determine which potential plot best corresponds to your potential plot. Start Field
Interactive Hint See how good your contour lines are by redrawing and after redraw, click to see the actual contours. Enable Contour Lines on Click
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| Field A. |
| Field B. |
| Field C. |
| Field D. |
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4.
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The panel on the left displays an electric field plot. The arrows in the field plot represent the direction and the colors represent the magnitude of the electric field. Draw the equipotential lines for this field by dragging the pencil (at its tip) after clicking the "draw on" button. After you have drawn your lines, determine which potential plot best corresponds to your potential plot. Start Field
Interactive Hint See how good your contour lines are by redrawing and after redraw, click to see the actual contours. Enable Contour Lines on Click
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| Field A. |
| Field B. |
| Field C. |
| Field D. |
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5.
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An equipotential plot is shown above. How much work must an external force do in order to move an electron (the red object) from [x,y]=[1.1,-1.5] to [x,y]=[-1.6,1.2]? The electric potential measured in Volts is shown next to the electron. Start
Interactive Hint More Help: Show electric field.
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| 7 x 10 -21 Joule. |
| -7 x 10 -21 Joule. |
| 3.5 x 10 -21 Joule.
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| 0 Joule. |
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6.
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An equipotential plot is shown above. How much work must an external force do in order to move an electron from [x,y]=[-0.5,-1.0] to [x,y]=[1.0,1.0]. Remember that you can measure the potential at any point by click-dragging the mouse. Start
Interactive Hint More Help: Show electric field.
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| -1.1 x 10 -20 Joule. |
| -5.8 x 10 -20 Joule. |
| -2.1 x 10 -19 Joule. |
| 2.1 x 10 -19 Joule. |
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7.
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Equipotential lines around a point charge are shown above. How much charge is located at the center? You can measure the potential at any point by dragging the test charge around. Distance is measured in m. Start
Interactive Hint More Help: Show electric field.
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| 0.10 mC |
| 0.15 mC |
| 0.20 mC
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| 0.25 mC |
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8.
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Two charged particles are shown with the charge on the right being 0.4mC. Find the unknown charge on the left. You can measure the potential at any point by dragging the test charge around. Distance is measured in m. Start
Interactive Hint More Help: Show electric field.
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| 20 mC
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| 0.25 mC |
| 0.36 mC |
| 0.4 mC |
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9.
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Four charges are shown (one is unknown) given in 10-10C that form what is known as a quadrupole. Determine the charge of the unknown charge. You can measure the potential at any point by dragging the test charge around. Distance is measured in m. Start
Interactive Hint More Help: Show electric field.
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| -0.5 mC. |
| 0.5 mC. |
| 0.25 mC. |
| 1 mC. |
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10.
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The panel on the left displays an equipotential plot. The contours represent points at the exact same potential. Draw the electric fieldl lines for this potential by dragging the pencil (at its tip) after clicking the "draw on" button. After you have drawn your lines, determine which field best corresponds to your potential plot. Start Potential
Interactive Hint See how good your field lines are by redrawing and after redraw, click to see the actual equipotential lines. Enable Field Lines on Click Note: There is a short delay between the "click" and the drawing of the field line.
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| Field A. |
| Field B. |
| Field C. |
| Field D. |
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11.
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E to V
The panel on the left displays an equipotential plot. The contours represent points at the exact same potential. Draw the electric field lines for this potential by dragging the pencil (at its tip) after clicking the "draw on" button. After you have drawn your lines, determine which field best corresponds to your potential plot.. Start Potential
Interactive Hint See how good your field lines are by redrawing and after redraw, click to see the actual field lines. Enable Field Lines on Click Note: There is a short delay between the "click" and the drawing of the field line.
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| Field A. |
| Field B. |
| Field C. |
| Field D. |
