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NEET
Exam
NEET
Subject
Physics
Chapter
Alternating Current

NEET · Physics · Alternating Current

Which graph shows the correct variation of r.m.s. current ' I '...

Which graph shows the correct variation of r.m.s. current ' I\mathrm{I} ' with frequency ' f\mathrm{f} ' of a.c. in case of (LCR) series resonance circuit? Which graph shows the correct variation of r.m.s. current ' I ' with frequency ' f ' of a.c. in case of (LCR) series

Options

  1. AQ
  2. BP
  3. CR
  4. DS

Correct answer

D. S

Step-by-step solution

In series, Z=(2π fL −12π fC )2+R2\mathrm{Z}=\sqrt{\left(2 \pi \mathrm{\text{ fL }}-\frac{1}{2 \pi \mathrm{\text{ fC }}}\right)^2+\mathrm{R}^2}Current,Current,I=\frac{\mathrm{V}}{\sqrt{\left(2 \pi \mathrm{fL}-\frac{1}{2 \pi \mathrm{fC}}\right)^2+\mathrm{R}^2}}Asfrequencyincreases,currentfirstincreasesandthendecreases.CurrentismaximumatresonancewhenAs frequency increases, current first increases and then decreases. Current is maximum at resonance when\mathrm{X}_{\mathrm{L}}=\mathrm{X}_{\mathrm{C}}
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