NCERT Solutions for Chapter: Current Electricity, Exercise 2: VSA

What are the advantages of the null-point method in a Wheatstone bridge? What additional measurements would be required to calculate $R_{\mathrm{unknown}}$ by any other method?

What Is the advantage of using thick metallic strips to join wires In a potentiometer?

For wiring in the home, one uses $\mathrm{Cu}$ wires or $\mathrm{Al}$ wires. What considerations are Involved in this?

Why are alloys used for making standard resistance coils?

Power $P$ is to be delivered to a device via transmission cables having resistance $R_c$. If $V$ is the voltage across $R$ and $I$ is the current through It, find the power wasted and how can It be reduced?

AB is a potentiometer wire (Figure). If the value of $R$ is increased, In which direction will the balance point $\mathrm{J}$ shift?

While doing an experiment with potentiometer (Figure) It was found that the deflection Is one sided

(a) the deflection decreased while moving from one end A of the wire to the end B.

(b) the deflection Increased, while the Jockey was moved towards the end B.

(i)  Which terminal $+\mathrm{or} -\mathrm{ve}$ of the cell $E_1$ is connected at $X$ in case (a) and how is $E_1$ related to $E$ 

(ii) Which terminal of the cell $E_1$ is connected at $X$ in case (b)?

A cell of emf $E$  and Internal resistance $r$ is connected across an external resistance $R$. Plot a graph showing the variation of potential difference  across $R$, verses $R$.