Current Electri...

For the following circuit the potential difference between x and y in volt is :-

The specific resistance of a wire

In the experiment of half deflection method the resistance R should be

A group of N cells whose emf varies directly with the internal resistance as per the equation $$E_{N}=1.5r_{N}$$ are connected as shown in the figure. The current I in the circuit is :-

The resistance of a coil in a platinum resistance thermometer at $$0^{\circ}C$$ is 5 ohm and at $$100^{\circ}C$$ it is 5.75 ohm. Its resistance at an unknown temperature is 5.15 ohm. Then the unknown temperature will be :-

The current voltage graph for a given metallic conductor at two different temperatures $$T_{1}$$ and $$T_{2}$$ are as shown in the figure. Then :-

Two resistance $$R_{1}$$ and $$R_{2}$$ are made of different materials. The temperature coefficient of the material of $$R_{1}$$ is $$\alpha $$ and of the material of $$R_{2}$$ is $$-\beta $$. The resistance of the series combination of  $$R_{1}$$ and $$R_{2}$$ will not change with temp., then ratio of resistance of two wire will be :-

In a typical Wheatstone network the resistance in cyclic order are $$A=10\:\Omega ,\:B=5\:\Omega ,\:C=4\:
\Omega $$ and $$D=4\:\Omega $$ for the bridge to be balanced :-

At what temperature will the resistance of a copper wire become three times its value at $$0^{\circ}C$$ [Temperature coefficient of resistance for copper $$=4\times 10^{-3}per^{\circ}C$$] :-

Which of the statement is wrong :-