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  • For designing a voltmeter of range 50 V and an ammeter of range 10 mA using a galvanometer which has a coil of resistance 54 <img alt="\Omega" src="https://entrancecorner.oncodecogs.com/gif.la

For designing a voltmeter of range 50 V and an ammeter of range 10 mA using a galvanometer which has a coil of resistance 54 \Omega showing a full scale deflection for 1 mA as in figure.

                                                  

(A) for voltmeter \mathrm{R} \approx 50 \mathrm{k} \Omega         (B) for ammeter \mathrm{r} \approx 0.2 \mathrm \Omega

(C) for ammeter \mathrm{r} \approx 6 \mathrm \Omega                (D) for voltmeter  \mathrm{R} \approx 5k \mathrm \Omega

(E) for voltmeter \mathrm{R} \approx 500 \mathrm \Omega

Choose the correct answer from the options given below :

 

Option: 1

(C) and (D)


Option: 2

 (A) and (B)


Option: 3

(C) and (E) 


Option: 4

(A) and (C)


Answers (1)

best_answer

For voltmeter,

\begin{aligned} & \mathrm{I}=\frac{50}{\mathrm{R}+54}=0.001 \mathrm{~A} \\ & \mathrm{R}=50 \mathrm{k} \Omega \end{aligned}

For Ammeter,

\begin{aligned} & \mathrm{I}_{\mathrm{r}}=10-1=9 \mathrm{~mA} \\ & \mathrm{~V}_{\mathrm{G}}=\mathrm{V}_{\mathrm{r}} \\ & 1 \mathrm{~mA} \times 54=9 \mathrm{~mA} \times \mathrm{r} \\ & \mathrm{r}=6 \Omega \end{aligned}

Posted by

vishal kumar

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