For which of the following combinations of working temperatures, the efficiency of Carnot's engine is maximum?
A galvanometer of resistance ' $G$ ' is converted into an ammeter of resistance $\frac{\mathrm{G}}{40}$, by connecting a shunt ' $S$ ' to it. The part of main current passing through the galvanometer is
The wrong statement out of the following statements is
The potentials at points A and B are $\mathrm{V}_{\mathrm{A}}$ and $\mathrm{V}_{\mathrm{B}}$ respectively for the charges $+q$ and $-q$ placed at distances ' $x$ ' each from points $A$ and $B$ as shown in figure. The distance between points $A$ and B is ' y '. The net potential $\left(\mathrm{V}_{\mathrm{A}}-\mathrm{V}_{\mathrm{B}}\right)$ is proportional to

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