The sensitivity of a tangent galvanometer is increased if

An ammeter of resistance $R$ gives a full-scale deflection when a current of $2 \ A$ passes through it. If it is to be converted into an ammeter to measure a maximum current of $10 \ A$,the required shunt is:

The sensitiveness of a moving coil galvanometer can be increased by decreasing:

The coil in a moving coil galvanometer experiences a torque proportional to the current passed through it. If a steady current $i$ is passed through it,the deflection of the coil is found to be $90^o$. Now,the steady current is switched off and a charge $Q$ is suddenly passed through the coil. If the coil has $N$ turns of area $A$ each and its moment of inertia is $I$ about the axis it is going to rotate,then the maximum angle through which it deflects upon passing $Q$ is:

$A$ galvanometer coil has a resistance of $990 \,\Omega$. It shows a full-scale deflection for a current of $10 \,mA$. Calculate the value of the shunt resistance required to convert it into an ammeter of range $1 \,A$.

The value of the shunt resistance that allows $10 \%$ of the main current through the galvanometer of $99 \Omega$ is (in $Omega$)