The current sensitivity of a moving coil galv | vedclass

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(D) The current sensitivity $(I_s)$ of a moving coil galvanometer is defined as the deflection produced per unit current,given by the formula:$I_s = \

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(D) The current sensitivity $(I_s)$ of a moving coil galvanometer is defined as the deflection produced per unit current,given by the formula:$I_s = \frac{	heta}{i} = \frac{NAB}{k}$Where:$N$ = Number of turns in the coil$A$ = Area of the coil$B$ = Magnetic field strength$k$ = Torsional constant of the springFrom the formula,it is evident that $I_s$ is directly proportional to $N$,$A$,and $B$.Therefore,increasing the magnetic field $(B)$,the area of the coil $(A)$,or the number of turns $(N)$ will increase the current sensitivity.Hence,the correct option is $(d)$.

The current sensitivity of a moving coil galvanometer can be increased by

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Mark out the correct options.

$A$ galvanometer having a resistance of $20\,\Omega$ and $30\,divisions$ on both sides has a figure of merit of $0.005\,A/division$. The resistance that should be connected in series so that it can be used as a voltmeter up to $15\,V$ is ........... $\Omega$.

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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