Assertion : The sensitivity of a moving coil | vedclass

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(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

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(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.

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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.