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Alternating Current — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
MCQ
Of the following about capacitive reactance which is correct?
  • A
    The reactance of the capacitor is directly proportional to its ability to store charge
  • B
    Capacitive reactance is inversely proportional to the frequency of the current
  • C
    Capacitive reactance is measured in farad
  • D
    The reactance of a capacitor in an AC circuit is similar to the resistance of a capacitor in a DC circuit
✓

Answer

  1. Capacitive reactance is inversely proportional to the frequency of the current

Explanation:

Capacitative reactance is an opposition to the change of voltage across an element.

It is denoted by XC​ and is inversely proportional to the signal frequency (f) and the capacitance C

$\text{X}_\text{c}=\frac{1}{2\pi\text{fc}}$

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