$A$ $100 \ W$ bulb is rated at $200 \ V$ and a $200 \ W$ bulb is rated at $100 \ V$. Then:

The two ends of a conductor are connected to a cell having an $e.m.f. \ E$ and some internal resistance. Starting from the midpoint $P$ of the conductor,moving in the direction of the current,and returning to point $P$,which of the following graphs best represents the potential $V$ versus the distance $x$ covered along the path?

$A$ thermocouple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of Bismuth is $-72\,\mu V/{^oC}$ and that of Tellurium is $500\,\mu V/{^oC}$. If the difference between hot and cold junction is $100\,{^oC}$, then the maximum output will be ............... $mV$.

The terminal voltage $V$ across a battery of $emf$ $E$ and internal resistance $r$ can be:

If a battery of voltage $V$ is connected across terminals $I$ of the black box shown in the figure,an ideal voltmeter connected to terminals $II$ gives a reading of $V/2$. While if the battery is connected to terminals $II$,a voltmeter across terminals $I$ reads $V$. The black box may contain:

$A$ galvanometer $(G)$ of $2 \ \Omega$ resistance is connected in the given circuit. The ratio of charge in $C_1$ $(4 \ \mu F)$ and $C_2$ $(6 \ \mu F)$ is: