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When frequency of DC source is double XL:

Correct answer: D. None

  • A. Doubles
  • B. Quadrupled
  • C. Tripled
  • D. None

Explanation

In electrical circuits, the inductive reactance (XL) of an inductor is calculated using the formula XL = 2πfL, where f is the frequency and L is the inductance. Direct Current (DC) does not alternate and has a frequency of zero. Since DC has no frequency, altering or doubling the frequency does not apply. Therefore, the reactance remains unaffected by changes in 'frequency' when dealing with DC, as it inherently lacks this characteristic. This is why the correct answer is 'None'.

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About Alternating Current

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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