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

Consider the following two statements $A$ and $B$ and identify the correct choice given in the answers.
$A$. Duddell's thermo-galvanometer is suitable to measure direct current only.
$B$. Thermopile can measure temperature differences of the order of $10^{-3} \, ^\circ C$.

To convert a galvanometer into an ammeter,one needs to connect a

To send $10 \%$ of the main current through a moving coil galvanometer of resistance $99 \Omega$,the shunt required is . . . . . . . (in $Omega$)

$A$ galvanometer of resistance $50 \Omega$ gives a full-scale deflection for a current of $5 \times 10^{-4} \text{ A}$. The resistance that should be connected in series with the galvanometer to read $3 \text{ V}$ is: (in $Omega$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module