If in the experiment of Wheatstone's bridge,the positions of cells and galvanometer are interchanged,then the balance point will

In the following network,the current flowing through the $15\Omega$ resistance is: (in $A$)

If the internal resistance of the battery is $1\, \Omega$, then what is the reading of the ammeter?

The effective resistance between points $A$ and $B$ is ............... $\Omega$.

$A$ Wheatstone bridge is initially at room temperature and all arms of the bridge have the same value of resistance $(R_1=R_2=R_3=R_4=R)$. When $R_3$ is heated to some temperature, its resistance value increases by $10 \%$. The potential difference $(V_a - V_b)$ (after $R_3$ is heated) is . . . . . . $V$. Given the total voltage is $40 \text{ V}$.

When the resistance $R$ (indicated in the figure below) is changed from $1 \, k\Omega$ to $10 \, k\Omega$,the current flowing through the resistance $R'$ does not change. What is the value of the resistor $R'$?