AC Fundamentals, Circuit and Circuit Theory
Time constant of an inductive circuit

Increases with decrease of inductance and increase of resistance
Increases with the increase of inductance and the increase of resistance
Increases with the decrease of inductance and decrease of resistance
Increases with increase of inductance and decrease of resistance

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AC Fundamentals, Circuit and Circuit Theory
The series and parallel resonance on L-C circuit' differs in that

Parallel resonance needs a low-resistance source for a sharp increase in impedance
Series resonance needs a high-resistance source for sharp increase in current
Parallel resonance needs a low-resistance source for a sharp rise in line current
Series resistance needs a low-resistance source for sharp rise in current

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