The figure shows a network of currents. The magnitude of currents is shown in the figure. The current $I$ will be ........... $A$.

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

In the circuit shown below,$E_1 = 4.0 \,V, R_1 = 2 \,\Omega, E_2 = 6.0 \,V, R_2 = 4 \,\Omega$ and $R_3 = 2 \,\Omega$. The current $I_1$ is ..................... $A$.

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 given Wheatstone bridge circuit,the current flowing through the $40 \Omega$ resistor is:

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