# Appendix

## Table A Measured forces on a test charge sphere due to spheres A and B. The test charge and sphere A are fixed. Three situations for sphere B are considered (including not present and two different positions, as explained in Video 1 and Figure 1). In each situation, is measured before and after the spheres are charged

sphere B | charge on each sphere/ | measured
--- | --- | ---
not present | 0 | −0.05 | −0.05 | −0.07 | −0.05 | −0.07 | −0.06
30 | 0.62 | 0.63 | 0.65 | 0.64 | 0.68 | 0.69
first position | 0 | −0.08 | −0.09 | −0.11 | −0.12 | −0.11 | −0.10
30 | 0.65 | 0.64 | 0.64 | 0.65 | 0.67 | 0.68
second position | 0 | −0.04 | −0.05 | −0.06 | −0.05 | −0.07 | −0.07
30 | 0.98 | 0.99 | 0.99 | 0.99 | 0.98 | 1.00

OpenLearn - Electromagnetism: testing Coulomb’s law
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