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

In the given part of a circuit,the potential at point $B$ is zero. Then the potentials at $A$ and $C$ respectively are

In a Wheatstone bridge,$P = 90\,\Omega$,$Q = 110\,\Omega$,$R = 40\,\Omega$,and $S = 60\,\Omega$. $A$ cell of $4\,V$ emf is connected across the input terminals. The potential difference between the diagonal points $B$ and $C$ (where the galvanometer is connected) is ............. $V$.

Four resistors $A, B, C$ and $D$ form a Wheatstone bridge. The bridge is balanced when $C = 100 \ \Omega$. If $A$ and $B$ are interchanged,the bridge balances for $C = 121 \ \Omega$. The value of $D$ is: (in $\Omega$)

In the following electrical network,the value of $I$ is (in $A$)

The Wheatstone bridge is in a balanced condition in the given figure, then $X = (in $Omega$)?$