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7. Alternating current — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics7. Alternating current1 Mark
MCQ
For the given figures, choose the correct options:
  • ✓
    The rms current in circuit $(b)$ can never be larger than that in $(a)$
  • B
    The rms current in figure $(a)$ is always equal to that in figure $(b)$
  • C
    The rms current in circuit $(b)$ can be larger than that in $(a)$
  • D
    At resonance, current in $(b)$ is less than that in $(a)$
✓

Answer

Correct option: A.
The rms current in circuit $(b)$ can never be larger than that in $(a)$
a
$I _{ rms }=\frac{220}{40}=5.5\,A$

$X _{ L }$ is not equal to $X _{ C }$. So rms current in $(b)$ can never be larger than $(a)$.

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