Lab2E-fieldandPotential

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University of Washington *

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Physics

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Dec 6, 2023

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Lab 2: Charges, Fields and Potential Lines 1. When you have two opposite but equal magnitude charges along a horizontal line (similar to the picture above), where is the potential the greatest? Is there ever a point where the potential will be zero? Yes, the potential is zero at the equipotential point. 2. When you have two of the same charges along a horizontal line, where is the potential the greatest? Is there ever a point where the potential will be zero? Potential is greatest at the point charges. There is no point where the potential will be zero. Activity 3 3. Make a long vertical line of positive charges by placing them very close together, similar to what’s shown to the right. How does the electric field change as you move around the line of charges? The value of the EF increases when the line is move from top to bottom and when moving bottom to top the value of the EF decreases. 4. Make a long vertical line of negative charges 2 meter from the positive charges similar to what’s shown below. This is your parallel-plate capacitor. How does the strength of the electric field change between the two lines? How does the direction of the electric field change between the two plates? The strength of the EF between the two lines will become lesser as you move from positive plate to the negative plate. The direction of the EF will always be from the positive plate to the negative plate. 5. Place sensors at 3 different locations between the lines to get readings of the electric field, each at different distances from the lines. 6. Use the voltmeter to draw lines of equal potential at the locations of the three sensors by clicking on the pencil button on the voltmeter. When you have the voltmeter at each distance, click this button. Doing so will record the potential V and draw a green line on the screen. Include a screenshot of your capacitor with 3 sensors and 3 green lines/circles.
7. Fill in the table below for each of the locations. (In order to see the potentials, you may need to move the sensors.) Location Distance from positive plate (m) Electric field E (V/m) Potential V (V) 1 0.92 40.6 33.9 2 1.97 40.2 -32.0 3 2.15 13.5 2.3 Activity 4 8. Place six +1 nC charges on top of each other somewhere on the left side of the screen. (It can go anywhere, but there needs to be enough space to measure 8 m away.) 9. From the box at the bottom, drag a Sensor and place it 1 m to the right of your charge. This sensor measures the E field at the location of its placing. In the table at right, record the E field magnitude at a distance r of 1 m. Ignore the degrees. 10. Drag the Sensor to the other distances shown in the table, then record the E field measurements. 11. Drag your Sensor back and replace it in the box at the bottom of the screen. r (m) E (V/m) 1 54.3 2 13.2 3 5.95 4 3.33 5 2.13 6 1.50 7 1.10 8 0.83 r (m) V (V) 1 54.17 2 26.52 3 17.9 4 13.41 5 10.69 6 8.99 7 7.69 8 6.71
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