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Appendix

Table A Measured forces cap f sub x 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, cap f sub x is measured before and after the spheres are charged

sphere B charge on each sphere/nC measured cap f sub x postfix solidus mN
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
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OpenLearn - Electromagnetism: testing Coulomb’s law
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