Assertion : The sensitivity of a moving coil | vedclass

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

Question

(C) The sensitivity of a moving coil galvanometer is given by $S = \frac{N B A}{k}$,where $N$ is the number of turns,$B$ is the magnetic field,$A$ is

Vedclass · Accepted Answer

If the Assertion is correct but Reason is incorrect.

Vedclass · Answer

(C) The sensitivity of a moving coil galvanometer is given by $S = \frac{N B A}{k}$,where $N$ is the number of turns,$B$ is the magnetic field,$A$ is the area,and $k$ is the torsional constant.By placing a soft iron core inside the coil,the magnetic field $B$ increases significantly due to the high magnetic permeability of the soft iron,thereby increasing the sensitivity.Soft iron is a ferromagnetic material with high magnetic permeability and low retentivity,meaning it can be easily magnetized and demagnetized.The Reason statement claims that soft iron 'cannot be easily magnetized or demagnetized',which is scientifically incorrect.Therefore,the Assertion is correct,but the Reason is incorrect.

Assertion : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.
Reason : Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.

Similar Questions

$A$ galvanometer of resistance $G$ can be converted into a voltmeter of range $V$ by connecting a resistance $R$ in series with it. The series resistance required to change its range to $\frac{V}{3}$ is

$A$ galvanometer has resistance '$G$' and range '$V_g$'. How much resistance is required to read voltage up to '$V$' volt?

In the circuit shown below,the ammeter and the voltmeter readings are $3 \text{ A}$ and $6 \text{ V}$ respectively. Then the value of the resistance $R$ is

$A$ voltmeter of resistance $1000\,\Omega$ gives full scale deflection when a current of $100\,mA$ flows through it. The shunt resistance required across it to enable it to be used as an ammeter reading $1\,A$ at full scale deflection is ............... $\Omega$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

Assertion : The sensitivity of a moving coil galvanometer is increased by placing a suitable magnetic material as a core inside the coil.Reason : Soft iron has high magnetic permeability and cannot be easily magnetized or demagnetized.