A galvanometer of resistance 50, Omega is con | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The initial total resistance is $R_{total,1} = R_G + R_1 = 50\, \Omega + 2950\, \Omega = 3000\, \Omega$.The current for full-scale deflection ($30

Vedclass · Accepted Answer

$4450$

Vedclass · Answer

(B) The initial total resistance is $R_{total,1} = R_G + R_1 = 50\, \Omega + 2950\, \Omega = 3000\, \Omega$.The current for full-scale deflection ($30$ divisions) is $I_1 = \frac{V}{R_{total,1}} = \frac{3\, V}{3000\, \Omega} = 1 	imes 10^{-3}\, A = 1\, mA$.To reduce the deflection to $20$ divisions,the new current $I_2$ must be proportional to the divisions: $I_2 = I_1 	imes \frac{20}{30} = 1\, mA 	imes \frac{2}{3} = \frac{2}{3}\, mA$.Using Ohm's law for the new circuit,$V = I_2 	imes R_{total,2}$,where $R_{total,2} = R_G + R_2$.$3\, V = (\frac{2}{3} 	imes 10^{-3}\, A) 	imes R_{total,2}$.$R_{total,2} = \frac{3 	imes 3}{2} 	imes 10^3\, \Omega = 4500\, \Omega$.Since $R_{total,2} = R_G + R_2$,the required series resistance is $R_2 = 4500\, \Omega - 50\, \Omega = 4450\, \Omega$.

Similar Questions

$A$ galvanometer coil has a resistance $90\, \Omega$ and full-scale deflection current $10\, mA$. $A$ $910\, \Omega$ resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is $0.1\, V$,the number of divisions on its scale is:

When a resistance of $100 \Omega$ is connected in series with a galvanometer of resistance $R$,its range is $V$. To double its range,a resistance of $1000 \Omega$ is connected in series. Find $R$. (in $\Omega$)

$A$ galvanometer has a coil of resistance $100 \, \Omega$ and gives a full-scale deflection for $30 \, mA$ current. If it is to work as a voltmeter of $30 \, V$ range,the resistance required to be added will be..... $\Omega$

What is voltage sensitivity? Write the equation for voltage sensitivity.

What is voltage sensitivity? Obtain its equation.

Vedclass Test Series

Exam Paper Generator

Online Exam Module