The potential at point $E$ for the given figure is ................ $V$.

The current $I$ in the given circuit will be $......A$.

$A$ Wheatstone's bridge is balanced with a resistance of $625\, \Omega$ in the third arm,where $P, Q$ and $S$ are in the $1^{st}, 2^{nd}$ and $4^{th}$ arm respectively. If $P$ and $Q$ are interchanged,the resistance in the third arm has to be increased by $51\,\Omega$ to secure balance. The unknown resistance in the fourth arm is ............. $\Omega$.

See the electrical circuit shown in the adjoining figure. Which of the following equations is a correct equation for it?

The equivalent resistance between $A$ and $B$ in the given circuit is . . . . . . . . (in $\Omega$)

The value of current $I$ in the given current distribution is: (in $A$)