Activity 1: Potential Surface Dbjective: Determine the electric potentials at different positions. Materials: clear plastic tray,Ir or glass tray. voltmeter. connecting wires with alligator clips. two aluminum or copper plates. power supply with variable voltage, salt. graphing paper. Procedure: 1} 2} '5'} Place a graphing paper on a table and put the clear plastic or glass tray on top of it. Attach one connecting wire to the positive terminal and another wire to the negative terminal of the power supply. [In the free end of each connecting wire. attach the aluminum or copper plate. This will serve as the electrode. The positive electrode is the one attached to The positive terminal of the power supply and the negative electrode is the one attached to the negative terminal. Fill the tray with water about onefourth full and mix it with salt to produce a salt solution. immerse the two plates on the solution separately and switch on the power supply. Adjust the voltage to EU] la". Tap the positive probe of the voltmeter to the positive electrode and the negative probe to the negative electrode. immerse the positive probe in the solution near the positive terminal. Move it in the solution to nd a voltage reading of 2.0 V. Use the graphing paper to nd the coordinates of die 2.3 ll potential. Plot die coordinates on a separate sheet of graphing paper. Repeat this step but this time, move to a different location. Talce at least ve points at which the potential is 1'3 "v". Perform another trial. but this time look for the potential readings of 3.0 'v' and 5.11] '9'. Plot the coordinates of the pints on the same graphing paper you used earlier. Connect the points by making a smooth curve. Question: Describe the locations of the points as the probe moves Through the solution. 1'Il'll'hat can you infer based on the result of the activity