Question

Classify the materials un terms of resistivity? Also explain super conductors _? gud luck ⚡​

Answer 1

Answer:

On the basis of resistivity substances are classified as conductors, insulators and resistors.

conductors are the substances which have very low electrical resistance.

insulators are the substances which have infinitely high resistance.

The electrical resistivity is the electrical resistance per unit length and per unit of cross-sectional area at a specified temperature. The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m). It is commonly represented by the Greek letter ρ, rho....

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Answer 2

Let's start from the Super Conductors.

Super Conductors Description

Those material in which Least Resistance is faced to the flow of current through them as compare to others are called Superconductors.

Examples :- Mercury at Temperature 4.2 Kelvin, Lead at 7.25 K Temperature becomes superconductors.

Applications of Superconductors

(i) For producing High Magnetic Field required for research work in high energy physics .

(ii) For the construction of very strong sensitive galvanometers .

(iii) it is used for making very strong electromagnets.

(iv) It is used for leviation and transportation (Trains which moves without rails)

(v) For storage of memory in high speed computers.

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Now Let's talk about Classification.

Classification of Materials

1. Conductor Description -

The Materials which can conduct electric current are called conductors .

They have low resistivities in the range of $\red{\bold{10}^{-8}}$ Ohms meter to $\red{\bold{10}^{-16}}$ ohms meter.

Copper and Aluminium have the Lowest Resistivity so their wire are used widely.

Nichrome has a resistivity of about 60 times that of Copper. It is used in the element of electric heater and electric irons.

2. Insulators Description -

The Materials which do not conduct electricity are known as insulators.

They have resistivity which ranges more than 10⁴ ohms meter.

Insulators like glass, mica, bakelite and hard rubbers have very high resistivity which ranges from $\red{\bold{10}^{4}}$ to $\red{\bold{10}^{16}}$ ohms metre.

3. Semi - Conductors -

These are the material whose resistivity is lying between those of conductors and insulators.

They have resistivity between $\red{\bold{10}^{-6}}$ to $\red{\bold{10}^{4}}$ ohms meter.

Example :- Germanium and Silicon