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Alternating Current — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
MCQ
When a voltage measuring device is connected to $AC$ mains, the meter shows the steady input voltage of $220V$. This means,
  • A
    Input voltage cannot be $AC$ voltage, but a $DC$ voltage.
  • B
    Maximum input voltage is $220V.$
  • ✓
    The meter reads not v but $\left\langle v^2\right\rangle a$ and is calibrated to read $\sqrt{<\text{v}^2>}$.
  • D
    The pointer of the meter is stuck by some mechanical defect.
✓

Answer

Correct option: C.
The meter reads not v but $\left\langle v^2\right\rangle a$ and is calibrated to read $\sqrt{<\text{v}^2>}$.

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