Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Current Electricity, Exercise 2: Critical Thinking

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

Consider the circuit shown in the figure. The current $I_{3}$ is equal to

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is $10^{-7}$ $\mathrm{\Omega }$ and the current passing through it is $0.1 \mathrm{A}$ ; cross-section of the wire is ${10}^{-6 }{\mathrm{m}}^2$. The potential gradient along the potentiometer wire is

In a potentiometer experiment, when three cells $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are connected in series, the balancing length is found to be $740 \mathrm{cm}$. If $\mathrm{A}$ and $\mathrm{B}$ are connected in series, balancing length is $440 \mathrm{cm}$ and for $\mathrm{B}$ and $\mathrm{C}$ connected in series, it is $540 \mathrm{cm}$ The emf of $E_{\mathrm{A}}$ , $E_{\mathrm{B}}$ and $E_{\mathrm{C}}$ are respectively. (in volts)

Potentiometer wire of length $1 \mathrm{m}$ is connected in series with $490 \mathrm{\Omega }$ resistance and $2 \mathrm{V}$ battery. If $0.2 \mathrm{mV} {\mathrm{cm}}^{-1}$ is the potential gradient, then resistance of the potentiometer wire is

In the circuit shown, the current through the $5 \mathrm{\Omega }$ resistor is

Assertion: In a metre bridge, the length of the wire is $1 \mathrm{m}$.

Reason: Greater the length of the wire, the better is the accuracy.

Assertion: A slide wire bridge is also called a metre bridge.

Reason: It is because the length of wire in a slide wire bridge is one metre.