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  • A moving coil galvnomter has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1V

A moving coil galvnomter has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1V the resistance in ohm needed to be connected in series with the coil will be:

Option: 1

99995


Option: 2

9995


Option: 3

10^{3}


Option: 4

10^{5}


Answers (1)

best_answer

\text { Voltage sensitivity }=\frac{\text { Current sensitivity }}{\text { Resis tan ce of galvanometer G} }

\begin{aligned} & \mathrm{G}=\frac{\text { Current sensitivity }}{\text { Voltage sensitivity }} \\ \\& \mathrm{G}=\frac{10}{2}=5 \Omega \end{aligned}

Full scale deflection current, \mathrm{i}_{\mathrm{g}}=\frac{150}{10}=15 \mathrm{~mA}

Voltage to be measured, \mathrm{V}=\mathrm{iR}=150 \times 1=150 \mathrm{~V}

Hence, \mathrm{R}=\frac{\mathrm{V}}{\mathrm{i}_{\mathrm{g}}}-\mathrm{G}=\frac{150}{15 \times 10^{-3}}-5=9995 \Omega

Posted by

Divya Prakash Singh

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