If the Wheatstone bridge with four resistors $R_1, R_2, R_3$ and $R_4$ is balanced,then the correct expression is

When the value of $R$ in the balanced Wheatstone bridge,shown in the figure,is increased from $5 \Omega$ to $7 \Omega$,the value of $S$ has to be increased by $3 \Omega$ in order to maintain the balance. What is the initial value of $S$ (in $Omega$)?

Find the value of the current through the $2\,\Omega$ resistance for the given circuit. (in $,A$)

If the Wheatstone bridge shown in the figure is balanced,then the values of $R_1$ and $R_2$ are ...... $\Omega$ and ...... $\Omega$ respectively.

The current through the $1 \Omega$ resistance in the following circuit is (in $A$)

In the circuit shown in the figure,the current $I$ is (in $\,A$)