Electronic Principles
Which one of the following phrases most accurately describes a purely inductive circuit?

None of these
The ac voltage lags the current by 90 degree
Inductive reactance provides the only opposition to current flow
Resistances provide the only opposition to current flow
Combinations of resistance and inductive reactance provide any opposition to current flow

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

capacitive reactance is greater than the inductive reactance
inductive reactance is equal to the capacitive reactance
inductive reactance is greater than the capacitive reactance
the difference between inductive and capacitive reactance is equal to the resistance
None of these

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