There are three voltmeters of the same range but of resistances $10000\,\Omega$,$8000\,\Omega$,and $4000\,\Omega$ respectively. The best voltmeter among these is the one whose resistance is ................ $\Omega$.

$A$ galvanometer has a deflection of $25$ divisions for a current of $0.1 \ A$ flowing through it. Then the current sensitivity of the galvanometer is (in $div/A$)

Explain the use of a galvanometer as a voltmeter.

In a moving coil galvanometer,the deflection of the coil $\theta$ is related to the electrical current $i$ by the relation

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

$A$ moving coil galvanometer of resistance $100 \ \Omega$ shows full-scale deflection when a current of $100 \ \mu A$ passes through it. If it is intended to show full-scale deflection when a current of $1 \ mA$ passes through it,the value of shunt resistance in ohms to be connected to the galvanometer is: