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Moving Charges and Magnetism — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsMoving Charges and Magnetism1 Mark
MCQ
How is galvanometer converted into a voltmeter?
  • A
    By connecting a high resistance multiplier in parallel to the galvanometer.
  • B
    By connecting a low resistance multiplier in parallel to the galvanometer.
  • C
    By connecting a low resistance multiplier in series with the galvanometer.
  • ✓
    By connecting a high resistance multiplier in series with the galvanometer.
✓

Answer

Correct option: D.
By connecting a high resistance multiplier in series with the galvanometer.
A galvanometer can be converted into voltmeter of given range by connecting a high resistance called multiplier in series with the galvanometer, whose value is given as:
$\text{R}\Big(\frac{\text{V}}{\text{I}_\text{g}}\Big)-\text{G}$
Where $V$ is the voltage to be measured, $l_g$ is the current for full scale deflection of galvanometer and $G$ is the resistance of galvanometer.

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