Demos: 5A-14 Electrophorus

Here is another method for transferring charge for static electricity demonstrations. Start by vigorously beating the fur against the sulphur plate. Take the metal electrophorus and set it on the Sulphur surface. Ground the electrophorus by touching it with your finger. Separate the electrophorus for the Sulphur and you have a source of positive electrical charge on the electrophorus.

The electrophorus works like this. Sulphur has a high affinity for electrons and fur has a low affinity. When the fur is rubbed vigorously against the sulphur, electrons will be stripped from the fur (low affinity) and accumulate on the sulphur (high affinity). Now bring the electrophorus in contact with the sulphur and ground it (touching it) and when you separate the electrophorus from the sulphur plate you will have accumulated a net positive charge on the electrophorus. There is also an acrylic plate which can be substituted for the Sulphur plate but it will yield the same results.

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