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7. Alternating current — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics7. Alternating current1 Mark
MCQ
An $LCR$ circuit as shown in the figure is connected to a voltage source $V_{ac}$ whose frequency can be varied.

The frequency, at which the voltage across the resistor is maximum, is......$Hz$

  • A
    $902$
  • B
    $143$
  • ✓
    $23$
  • D
    $345$
✓

Answer

Correct option: C.
$23$
c
Frequency $\mathrm{f}=\frac{1}{2 \pi \sqrt{\mathrm{LC}}}$

$=\frac{1}{2 \times 3.4 \sqrt{24 \times 2 \times 10^{-6}}}$

$=23\, \mathrm{Hz}$

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