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

When a galvanometer is shunted by a resistance $S$, its current capacity increases $n$ times. If the same galvanometer is shunted by another resistance $S'$, its current capacity will increase to $n'$. The value of $n$ in terms of $n'$, $S$, and $S'$ is

$A$ galvanometer coil of resistance $50 \,\Omega$ shows full-scale deflection for a current of $100 \,\mu A$. The shunt resistance to be added to the galvanometer to convert it into an ammeter of range $10 \, mA$ is:

$A$ galvanometer having a resistance of $9 \, \Omega$ is shunted by a wire of resistance $2 \, \Omega$. If the total current is $1 \, A$, the part of it passing through the shunt will be ............ $A$.

The resistance of a galvanometer is $90\, \Omega$. If only $10\%$ of the main current is to flow through the galvanometer,how should a resistor be connected and what should be its value?

Write the equation for the maximum torque acting on a current-carrying loop in a galvanometer.

Vedclass Test Series

Exam Paper Generator

Online Exam Module