Question

1. Material A and B have a resistivity of 2.2x10-8 Ωm and 10x108 Ωm respectively. What is the nature (conductor or Insulator) of A and B ?

2. What is the resistivity of an alloy of copper and nickel ?

3. How the resistivity of a material does changes with change in temperature

Answer 1

Answer:

1)

Material A is conductor while material B is insulator

2)

The alloy of copper and nickel has small resistivity

3)

As temperature increases the resistivity will increase

Explanation:

1).

As we know that the resistivity of material is more than it will behave like an insulator while for smaller resistivity it behaves like conductor

Material A has resistivity

$\rho_a = 2.2 \times 10^{-8} ohm-m$

also for material B we have

$\rho_b = 10 \times 10^8 ohm-m$

so here material B is insulator while material A is conductor

2)

Resistivity of alloy of copper and nickel is small as these wires are used for the transmission wires for electricity

3)

As the temperature of the material increases the resistivity of the material also increases

so we will have

$\rho = \rho_0(1 + \alpha \Delta T)$

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Topic : Resistivity

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Answer 2

As we know that the resistivity of material is more than it will behave like an insulator while for smaller resistivity it behaves like conductor

Material A has resistivity

also for material B we have

so here material B is insulator while material A is conductor

2) Resistivity of alloy of copper and nickel is small as these wires are used for the transmission wires for electricity

3) As the temperature of the material increases the resistivity of the material also increases

so we will have

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Topic : Resistivity