Consider a moving coil galvanometer (MCG) :A | vedclass

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

Question

(A) $A :$ The torque $	au = C	heta$,where $C$ is the torsional constant. Thus,$[C] = [	au]/[	heta] = [ML^2 T^{-2}] / [1] = [ML^2 T^{-2}]$. Stateme

Vedclass · Accepted Answer

$A, B$ only

Vedclass · Answer

(A) $A :$ The torque $	au = C	heta$,where $C$ is the torsional constant. Thus,$[C] = [	au]/[	heta] = [ML^2 T^{-2}] / [1] = [ML^2 T^{-2}]$. Statement $A$ is correct.$B :$ Current sensitivity $(I_s) = \frac{NBA}{k}$ and Voltage sensitivity $(V_s) = \frac{I_s}{R} = \frac{NBA}{kR}$. Increasing $N$ increases $I_s$,but $R$ also increases with $N$,so $V_s$ may not increase. Statement $B$ is correct.$C :$ Since $V_s = \frac{NBA}{kR}$ and $R \propto N$,if $N 	o 2N$,then $R 	o 2R$. Thus,$V_s' = \frac{(2N)BA}{k(2R)} = V_s$. The voltage sensitivity remains unchanged. Statement $C$ is incorrect.$D :$ To convert $MCG$ to an ammeter,a small shunt resistance is connected in parallel. Statement $D$ is incorrect.$E :$ Current sensitivity $I_s = \frac{NBA}{k}$,so $I_s \propto N$. It depends directly on the number of turns. Statement $E$ is incorrect.Therefore,only $A$ and $B$ are correct.

Similar Questions

$A$ galvanometer of resistance $G \ \Omega$ is shunted by a resistance $S \ \Omega$. To keep the main current in the circuit unchanged,the resistance to be connected in series with the galvanometer is

The current flowing through a coil of resistance $900 \, \Omega$ is to be reduced by $90 \, \%$. What value of shunt should be connected across the coil in $\Omega$?

The resistance of a galvanometer is $25\,\Omega$ and it requires $50\,\mu A$ for full-scale deflection. The value of the shunt resistance required to convert it into an ammeter of $5\,A$ range is:

If only $1 \%$ of the total current is passed through a galvanometer of resistance $G$,then the resistance of the shunt is:

How are a voltmeter and an ammeter connected in a circuit? Explain.

Vedclass Test Series

Exam Paper Generator

Online Exam Module