An ammeter gives full-scale deflection when a current of $2 \, A$ flows through it. The resistance of the ammeter is $12 \, \Omega$. If the same ammeter is to be used for measuring a maximum current of $5 \, A$,then the ammeter must be connected with a resistance of:

What is voltage sensitivity? Write the equation for voltage sensitivity.

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:

$A$ millivoltmeter of $25 \, mV$ range is to be converted into an ammeter of $25 \, A$ range. The value (in $\Omega$) of the necessary shunt will be:

In the given figure,an ammeter $A$ consists of a $240 \Omega$ coil connected in parallel to a $10 \Omega$ shunt. The reading of the ammeter is . . . . . . $mA$.

$A$ moving coil galvanometer has $N$ number of turns in a coil of effective area $A$,and it carries a current $I$. The magnetic field $B$ is radial. The torque acting on the coil is: