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Consider the following statements and select the correct answer from the codes given below: 

Assertion (A): Reciprocal of resistivity is called specific conductance. 

Reason (R): Reciprocal of resistance is called the thermal conductivity. 


1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. A is true but R is false
4. A is false but R is true

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Correct Answer - Option 3 : A is true but R is false

A is true and B is false

Concept:

Resistivity: 

  • It is the resistance of unit length and unit cross-sectional area of the body.
  • It is the intrinsic property of the material itself.
  • It depends upon the nature and temperature of the material.
  • The resistance of wire with resistivity ρ, length l, and cross-sectional Area A is given as

\(R = ρ \frac{l}{A}\)

Conductivity:

  • Electrical conductivity is the measure of the amount of electrical current a material can carry or it's the ability to carry a current.
  • It is the reciprocal of resistivity.
  • It is also known as specific conductance.
  • It is an intrinsic property of a material.
  • It is denoted by the symbol σ and has SI units of Siemens per meter (S/m).

Thermal Conductivity:

  • Thermal conductivity denotes the ability to conduct heat. 
  • It is the property of a material that determines the degree by which it will conduct heat.
  • It is denoted by K 

Explanation:

  • The thermal conductivity here is related to heat and resistivity and conductivity is related to the transfer of electricity. 
  • So, practically there is no relationship between resistivity and thermal conductivity. So, statement R is incorrect.
  • Also, conductivity is reciprocal of resistivity, So statement A is correct.

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