Electrical Resistance, Resistivity and Conductivity

A physical quantity, associated with electrical conductivity, has the SI unit ohm-meter. Identify this physical quantity.

A $1 \mathrm{m}$ long wire is broken into two unequal parts $X$ and $Y$. The $X$ part of the wire is stretched into another wire $W$. Length of $W$ is twice the length of $X$ and the resistance of $W$ is twice that of $Y$. Find the ratio of length of $X$ and$Y$.

A wire of resistance $R_1$ is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to original resistance is:

An aluminium wire is stretched to make its length, $0.4\%$ larger. The percentage change in resistance is

Two wires that are made up of two different materials whose specific resistances are in the ratio $2:3$, length $3:4$ and area $4:5$. The ratio of their resistance is $\alpha$. Write value of $8\alpha$.

A wire-wound resistor is an electrical _____ component that limits current. 

A wire wound resistor is an electrical passive device that limits or restricts _____ flow in a circuit.

A wire wound resistor is an electrical passive component that limits current. 

What is wire bound resistor?

A thick wire is stretched, so that its length becomes two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to initial resistance of wire ?

A solid metallic cuboid of homogeneous material having geometrical dimension as shown in the figure will have a ratio of resistances for the sense of current along $x$, $y$ and $z$ directions respectively, equal to

From the given figure what should be the magnitude of carbon resistor?

A uniform wire of length $l$ and radius $R$ has a resistance of $100 \Omega$. It is recast into a wire of radius $\frac{R}{2}$. The resistance of new wire will be-

Two rods of copper and iron with the same cross sectional area are joined at $S$ and a steady current $I$ flows through the rods as shown in the figure.

Choose the most appropriate representation of charges accumulated near the junction $S$.

Conductivity of the metal is

In given diagram value of carbon resistor is $22\times {10}^5 \mathrm{\Omega } \pm 5\%$. Write colour of the first ring A.

Two metal slabs of equal lengths, equal cross sectional areas and having resistances in the ratio $1:2$ are connected first in series and then in parallel separately. The ratio of their effective conductivities is

A graph drawn between current $I$ and voltage $V$ in a conductor is as shown in the figure. The changes in the resistance in $1^{\text{st }}$ and $3^{\text{rd }}$ parts respectively

A cylindrical conductor has a uniform cross-section. The resistivity of its material increases linearly from left end to right end. If a constant current is flowing through it and at a section distance $x$ from left end, the magnitude of electric field intensity is $E$, which of the following graphs is correct?

The length of a given cylindrical wire is increased by $100\%$. Due to the consequent decrease in diameter the change in the resistance of the wire will be