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By measuring the electric current (the number of electrons flowing through the circuit per second) in the metal part of the circuit the number of charges being carried by the ions in the vacuum part of the circuit can be determined. For a continuous beam of ions (each with a single charge)where N is the number of ions observed in a time t (in seconds) yeti cup, I is the measured current (in amperes) and e is the elementary charge (about 1.60 1019 C). Thus yeti cup, a measured current of one nanoamp (109 A) corresponds to about 6 billion ions striking the faraday cup each second.Similarly, a Faraday cup can act as a collector for electrons in a vacuum (for instance from an electron beam).

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