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7. Alternating current — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics7. Alternating current1 Mark
MCQ
In $L-C-R$  circuit if resistance increases, quality factor
  • A
    increases finitely
  • ✓
    decreases finitely
  • C
    remains constant
  • D
    None of the above
✓

Answer

Correct option: B.
decreases finitely
b
b
The $Q-$ factor of series resonant circuit is given by $Q\, = \,\frac{{\omega _r^2L}}{R}$  It is evident from the relation that as $R$  is  increased, $Q-$ factor of the circuit is decreased.

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