The current flowing in a coil of resistance $90 \,\Omega$ is to be reduced by $90\%$. What value of resistance should be connected in parallel with it? ............. $\Omega$

In the adjacent circuit,a voltmeter of internal resistance $R$,when connected across $B$ and $C$,reads $\frac{100}{3} \ V$. Neglecting the internal resistance of the battery,the value of $R$ is ................. $k \Omega$.

Consider the circuit shown in the figure. Find the current through the $10\,\Omega$ resistor when the switch $S$ is $(a)$ open $(b)$ closed.

By error,a student places a moving-coil voltmeter $V$ (nearly ideal) in series with the resistance in a circuit in order to read the current,as shown. The voltmeter reading will be ............ $V$.

An electrical circuit consists of ten $100 \,\Omega$ resistors. Out of these $10$ resistors,a group of $n_1$ resistors are connected in parallel and another group of $n_2$ resistors are separately connected in parallel. These two groups are then connected in series and this combination is connected to a voltage source of $100 \,V$. If the net current through the circuit is $2.5 \,A$,the values of $n_1$ and $n_2$ are:

In the given figure, an ammeter reads $5 \, A$ and a voltmeter reads $40 \, V$. The actual value of resistance $R$ is