phy114 lab3 - Electric Field Plotting II Objective The...

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Electric Field Plotting II Objective: The objective of this lab was to investigate the nature of the electric field for the setup with two concentric circles and the setup with a line conductor and a point charge using a digital voltmeter(DVM). Electric field lines always start on positive charges and end on negative charges. In the case of the two concentric circles, field lines will start on the inner circle and travel to the outer circle. In the second setup, the field lines will start on the line conductor and end on the point charge. There should also be equipotential lines, formed by points that have no voltage difference between them. In addition, equipotential lines should always be perpendicular to electric field lines. In the concentric circle setup, equipotential points should be equidistant from the inner circle, so that the equipotential line is circular. The electric field intensity should gradually decrease as distance from the inner circle(r) increases. The equipotential lines for the line-point setup would be less predictable. Equipotential lines should be horizontal lines near the line conductor, however, in the area closer to the point charge, equipotential lines should have increasing curvature, because the field lines curves around a dipole while it is vertically linear around a line conductor as seen in the previous experiment. Procedure: First, the power supply was connected to the conductive paper with the concentric circle setup. The positive charge was connected to the inner circle, while the negative charge was attached to the outer circle. Then, the single probe attached to the DVM was
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