Question

Define resistivity. Write an expression for the resistivity of a substance.Give the meaning of each symbol which occurs in it.​

Answer 1

Answer:

Resistivity , ρ=lR×A. where, R is the resistance of the conductor. A is the area of cross - section of the conductor. l is the length of the conductor.

Explanation:

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Answer 2

Answer:

Resistivity is defined as resistance of unit length and unit area of a conductor.

Resistivity , ρ= R×A/l

where, R is the resistance of the conductor

A is the area of cross - section of the conductor

l is the length of the conductor.

Explanation: