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

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 $Omega$)

Consider the following circuit shown below. All the resistors are identical. The ratio of $I / I^{\prime}$ is

Kirchhoff's first law $(\Sigma i = 0)$ and second law $(\Sigma iR = \Sigma E)$ are based on which of the following respectively? (Where the symbols have their usual meanings.)

As shown in the circuit diagram,find the value of $I = \text{ . . . . . . }$. (in $\text{ A}$)

Consider the circuit shown in the figure. The current ${I_3}$ is equal to