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  • A galvanometer of resistance 10 ohm gives full-scale deflection for a current of 10mA. How can this galvanometer be used as a voltmeter having a voltage range of 0-5V?<s

A galvanometer of resistance 10 ohm gives full-scale deflection for a current of 10mA. How can this galvanometer be used as a voltmeter having a voltage range of 0-5V?

Option: 1

480\Omega


Option: 2

470\Omega


Option: 3

490\Omega


Option: 4

500\Omega


Answers (1)

best_answer

A voltmeter having a volate range of zero to \left(V_{A}-V_{B}\right) is obtained if a resistance R is connected in series with the galvanometer and the instrument is used between the points A and B-

In the given problem,

V_{A}-V_{B}=5 \mathrm{~V}

Now, 

\begin{aligned} & V_{A}-V_{B}=I_{G}(G+R) \\ & R=\frac{V_{A}-V_{B}}{I_{C}}-C_{1}=\frac{5}{0.01}-10=500-10=490 \Omega \end{aligned}

 

Posted by

Devendra Khairwa

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