The deflection in a moving coil galvanometer | vedclass

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

Question

(B) Let $G$ be the resistance of the galvanometer and $I$ be the total current.When the galvanometer is shunted with a resistance $S = 40 \Omega$,the

Vedclass · Accepted Answer

$40$

Vedclass · Answer

(B) Let $G$ be the resistance of the galvanometer and $I$ be the total current.When the galvanometer is shunted with a resistance $S = 40 \Omega$,the current flowing through the galvanometer $I_G$ is given by the current divider rule:$I_G = I \left( \frac{S}{G + S} \right)$Given that the deflection is reduced to half,the current through the galvanometer becomes half of the total current,i.e.,$I_G = \frac{I}{2}$.Substituting this into the equation:$\frac{I}{2} = I \left( \frac{40}{G + 40} \right)$$\frac{1}{2} = \frac{40}{G + 40}$$G + 40 = 80$$G = 40 \Omega$Therefore,the resistance of the galvanometer is $40 \Omega$.

The deflection in a moving coil galvanometer is reduced to half when it is shunted with a $40 \Omega$ coil. The resistance of the galvanometer is (in $Omega$)

Similar Questions

Explain: "Increasing the current sensitivity may not necessarily increase the voltage sensitivity".

The deflection in a moving coil galvanometer falls from $50$ divisions to $10$ divisions,when a shunt of $12 \Omega$ is connected with it. The resistance of the galvanometer coil is . . . . . . . (in $Omega$)

When a shunt resistance of $4r$ is connected to a galvanometer,it becomes an ammeter that can measure $0.03 \, A$. When a shunt resistance of $r$ is connected to the same galvanometer,it becomes an ammeter that can measure $0.06 \, A$. What is the current capacity $(i_g)$ of the galvanometer in $A$?

The resistance of an ideal voltmeter is . . . . . . .

$A$ voltmeter has a resistance of $G \ \Omega$ and a range of $V \ \text{volt}$. The resistance required in series to convert it into a voltmeter of range $nV \ \text{volt}$ is . . . . . . .

Vedclass Test Series

Exam Paper Generator

Online Exam Module