In the moving coil galvanometer, if the numbe | vedclass

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

Question

(C) Current sensitivity is defined as $I_s = \frac{NAB}{k}$, where $N$ is the number of turns, $A$ is the area, $B$ is the magnetic field, and $k$ is

Vedclass · Accepted Answer

will be doubled, remains unchanged

Vedclass · Answer

(C) Current sensitivity is defined as $I_s = \frac{NAB}{k}$, where $N$ is the number of turns, $A$ is the area, $B$ is the magnetic field, and $k$ is the torsional constant.If $N$ is doubled, $I_s$ becomes $2 	imes I_s$, meaning it is doubled.Voltage sensitivity is defined as $V_s = \frac{I_s}{R} = \frac{NAB}{kR}$, where $R$ is the resistance of the coil.Since the resistance $R$ is directly proportional to the length of the wire, and the length is proportional to the number of turns $(R \propto N)$, doubling $N$ also doubles $R$.Substituting these into the formula: $V_s = \frac{(2N)AB}{k(2R)} = \frac{NAB}{kR}$.Thus, the voltage sensitivity remains unchanged.

In the moving coil galvanometer, if the number of turns in the coil is doubled, then the current sensitivity . . . . . . and the voltage sensitivity . . . . . . .

Similar Questions

The resistance of a galvanometer is $50\,\Omega$ and the current required to give full-scale deflection is $100\,\mu A$. In order to convert it into an ammeter reading up to $10\,A$,it is necessary to put a resistance of

$A$ galvanometer whose resistance is $120 \, \Omega$ gives full-scale deflection with a current of $0.05 \, A$. To enable it to read a maximum current of $10 \, A$,a shunt resistance is added in parallel with it. The resistance of the ammeter so formed is .............. $\Omega$.

$A$ galvanometer has a resistance of $100 \, \Omega$ and a full-scale range of $50 \, \mu A$. It can be used as a voltmeter or as a high-range ammeter provided a resistance is added to it. Pick the correct range and resistance combination.

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 $10^{-3} \, ^\circ C$.

The resistance of an ammeter is $13\, \Omega$ and its scale is graduated for a current up to $100\, A$. After an additional shunt has been connected to this ammeter,it becomes possible to measure currents up to $750\, A$ by this meter. The value of the shunt resistance is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module