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  • Full scale defelction occurs in a moving coil galvanometer of resistance 36 when 100mA current flows through

Full scale defelction occurs in a moving coil galvanometer of resistance 36\Omega when 100mA current flows through it. What arrangements should be done to convert it into a voltmeter of 0.5V range?

Option: 1

16\Omega


Option: 2

14\Omega


Option: 3

10\Omega


Option: 4

12\Omega


Answers (1)

best_answer

Resistance of the galvanometer=36\Omega, max current I_G=100mA=0.1A

Connecting a resistance R in series with the galvanometer and using the equipment in between the two points A and B, we shall get a voltmeter to measure voltage difference ranging from 0 to (V_A-V_B)

Here, (V_A-V_B) = 5V 

Now,

\begin{aligned} & V_A-V_B=I_a(G+R) \\ & R=\frac{V_A-V_B}{I_a}-G=\frac{5}{0.1}-36=14 \Omega \end{aligned}

Posted by

Pankaj

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