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The electrical resistivity of pure silver near 0 K is:
1. very low but measurable
2. not measurable
3. below 100 ohm/meter
4. very high

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Correct Answer - Option 1 : very low but measurable

Concept -

  • Electrical resistivity (also known as specific electrical resistance ) is a material property that determines how strongly it is opposing the flow of current.
  • The Greek letter  'ρ'  is widely used to signify resistance (rho). 
  • Ohm-meter is the SI unit for electrical resistivity. 
  • The electrical resistivity can be calculated with the help of - 

\(\rho =\frac{R A}{l}\)

Where,

  • R = electrical resistance of the material 
  • l = length of the material
  • A = the cross-section of the given material 

Explanation -

  • Silver is the best conductor of electricity which means that its electrical resistivity will be very low but measurable

  • Electrical resistivity helps us to know how well a material will allow the current to pass through.
  • If the electrical resistivity of the material is high then it will oppose the flow of current within it which means it is not a good conductor of electricity.
  • If the electrical resistivity of the material is low then the opposition to the flow of current will be less, hence the material will be a good conductor of electricity. 

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