Email
Chat with tutor
logo

Ask Questions, Get Answers

X
 
Answer
Comment
Share
Q)

A multi range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure $2V,20V$ and $200\;V$ using a galvanometer of resistance $10\Omega$ and that produces maximum deflection for current of $1mA$ Find $R_1,R_2$ and $R_3$ that have to be used

$\begin{array}{1 1} 18\;K\;\Omega \\ 180\;K\;\Omega \\ 1800\;K\;\Omega \\ 1.8 \; \Omega \end{array} $

1 Answer

Comment
A)
Solution :
given : $G= 10 \Omega$
$I_g= 1mA$
$\quad= 10^{-3} \;A$
$V=2$
$R_1= \large\frac{V}{I_g}$$-G$
$\quad= \large\frac{2}{10^{-3}}$$-10$
$\quad= 1990 \Omega$
$\qquad = 2k \Omega$
(ii) $v= 20\;v ,(R_1+R_2) =\large\frac{20}{10^{-3}}$$-10=20,000 -10^{\circ}$
$\quad \approx 20 k \Omega$
(iii) $v= 200 \;v, R_1 +R_2+R_3=\large\frac{200}{10^{-3}}$$-10 \approx 200 \;K \Omega$
$R_1 = 2k \Omega , R_2 = 20 \;k \Omega$
$R_3 = 200 -20 =180 k \Omega $
Answer : $180\;K\;\Omega $
Help Clay6 to be free
Clay6 needs your help to survive. We have roughly 7 lakh students visiting us monthly. We want to keep our services free and improve with prompt help and advanced solutions by adding more teachers and infrastructure.

A small donation from you will help us reach that goal faster. Talk to your parents, teachers and school and spread the word about clay6. You can pay online or send a cheque.

Thanks for your support.
Continue
Please choose your payment mode to continue
Home Ask Homework Questions
Your payment for is successful.
Continue
Clay6 tutors use Telegram* chat app to help students with their questions and doubts.
Do you have the Telegram chat app installed?
Already installed Install now
*Telegram is a chat app like WhatsApp / Facebook Messenger / Skype.
...