Question

-brainlist-
*if you give answer in full detail I will mark you as brainlist*
1.What is electrical resistivity of a material? What is its unit? Describe an experiment to study the factors on which the resistance of conducting wire depends.​...

Answer 1

Answer:

Electrical resistivity is numerically equal to the resistance per unit length per unit area.

SI unit is ohm metre

Factors-

1. Nature of the material- For copper resistivity will be different than lead.
2. Temperature - With increase in temperature,resistivity increases

Answer 2

Answer:

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Explanation:

Ans. The inherent property of a conductor because of which it resists the flow of electric

current is called resistivity. Resistivity for a particular material is unique,

(Ohm metre),

The SI unit of resistivity is Experiment to study the factors on which resistance of conducting wire depends:

• Take an ammeter, electric cell, plug key, nichrome wire and wires of different

materials

Make the circuit as shown in figure.

• Start the experiment with nichrome wire. Attach it in the circuit and take ammeter

reading

• Change the length of nichrome wire and take ammeter reading

• Change the thickness of nichrome wire and take ammeter reading

After above steps, use copper wire for the experiment. Attach a copper wire in the

circuit and take ammeter reading.

Change the length of copper wire and take ammeter reading,

Change the thickness of copper wire and take ammeter reading

• Repeat above steps with wires of different materials

Observations:

• It is seen that resistance depends on material of conductor.

Resistance depends on length of conductor.

• • Resistance depends on area of cross-section.