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What is the electrical resistivity of a material? What is its unit? Describe an experiment to study the factors on which the resistance of conducting wire depends

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  • Resistivity is an inherent property of a conductor which resists the flow of electric current. Resistivity of each material is unique. 
  • SI unit of resistance is Ωm.

Experiment to study the factors on which the resistance of conducting wire depends. 

  • Take a nichrome wire, a torch bulb, a 10 W bulb and an ammeter (0 – 5 A range), a plug key and some connecting wires. 
  • Set up the circuit by connecting four dry cells of 1.5 V each in series with the ammeter leaving a gap XY in the circuit, as shown in Fig.


  • It is observed that resistance depend on material of conductor.
  • Length of conductor determines resistance
  • Resistance depends on area of cross section.

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