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Alternating Current — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
MCQ
In LCR series AC circuit.
  • A
    If R is increased current will decrease.
  • B
    If L is increased current will decrease.
  • C
    If C is increased current will increase.
  • D
    If C is increased current will decrease.
✓

Answer

  1. If R is increased current will decrease.

Explanation:

$\text{I}=\frac{\text{V}}{\text{Z}}=\frac{\text{V}}{\sqrt{\text{R}^2\Big(\omega\text{L }\sim}\frac{1}{\omega\text{C}}\Big)^2}$

By increasing R, current will definitely decrease by change in L or C, current may increase or decrease.

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