Why don't my experimental electric field values agree with the true values, although I tried to be as precise as possible using the Phet simulation? (It was expected in the lab instructions but we were asked to give an explanation as to why?)

*Hint from the lab manual: -You don't have to answer the question about if +/- 1 in the last digit displayed is a good assumption, but it may play into your reason why your measured electric field and the "real" electric field do or do not agree.

91.5 deg -91.5 deg 4.90 V/m 4.96 V/m . 145.7 deg 3.67 V/m . 2.5 V 5.6 V . ON . . . 11.2 V -7.4 V -4.0 V + . . . . .\fCalculate the electric field Pick an electric eld arrow anywhere on the screen. Put the crosshairs of the equipotential tool at one end of the arrow. Record the potential reading, V1, and its uncertainty, 6V1, in your Data section. Assume the uncertainty in the potential is +/- 1 in the last digit displayed. (Move the equipotential tool ever so slightly. Do you think this a good assumption?) Now move the crosshairs of the equipotential tool to the other end of the arrow. Record the new potential reading, V2, and its uncertainty, 6V2. Subtract the two potential readings to get the potential difference, AV. The uncertainty in the potential difference, 61W, is found from 6M = '6V12 + 6sz The electric eld at the midpoint between the two measurements is E_AV _d where dis the distance between the two measurements of potential. (Technically there is a negative sign in the above equation the electric field points downhill but we're just considering the magnitude here.) Use the tape measure tool to measure the length of the arrow. Again, assume the uncertainty in the distance, (id, is +/ 1 in the last digit displayed. The uncertainty in the electric field is ) You can check your calculation of the electric field using the yellow \"Sensors\" button at the I\" bottom of the screen. Drag it to the center of the arrow to find the \"rea electric field. I\" Discussion Question: Does your value of the electric field agree with the "rea value of the electric eld within measurement uncertainty? (Remember, Yes/No because...)