Reactance offered by a coil having no resistance in a.c circuit is equal to:
Correct answer: B. ωL
- A. 1/ωL
- B. ωL
- C. ω2L2
- D. ωLR
Explanation
The correct option, ωL, represents the inductive reactance in an AC circuit, where ω is the angular frequency and L is the inductance of the coil. It quantifies the opposition to the flow of alternating current caused by the coil's inductance.
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Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
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