Electronic Principles
To get the Norton current, you have to

Short the voltage source
None of these
Short the load resistor
Open the voltage source
Open the load resistor

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Electronic Principles
The total impedance of a parallel RLC circuit:

always increases as the applied frequency increases
always decreases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
None of these
is maximum at the resonant frequency

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