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What is the order of magnitude of the current measured by a
Retarding Potential Analyzer at 400 km altitude above Earth in a
plasma with 104 particles/cm3 with 1 cm2 collector plate at zero
retarding voltage (assume that all electrons are repelled by the
grids)?
O 1 nA
10 pA
O 10 microA
100 nA
O1 mA

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