Question

Statement-1 : The resistivity for a substance is its resistance
when it is one meter long and its area of cross section is one
square meter.
Statement-2 : The SI units of resistivity is ohm metre (????m).

Answer 1

Both assertion and reason are true but reason is not the correct explanation of the assertion.

Explanation:

We know that:

R ∝ 1 / A or

R = ρ ( l / A )

where proportionality constant ρ is called resistivity.

If l = 1 m and A = 1 m^2

Then R = ρ i.e., resistance = Resistivity.

Thus both assertion and reason are true but reason is not the correct explanation of the assertion.

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