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Q.

Statement A: 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 B: The SI units of resistivity are ohm metre (Ωm) and ohm centimeter (Ω cm).

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a

Both Statement A and Statement B are true

b

Both Statement A and Statement B are false

c

Statement A is true but Statement B is false.

d

Statement A is false but Statement B is true.

answer is A.

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Detailed Solution

We know, R∝lA or R=ρ(lA), where proportionality constant ρ is called resistivity. If l=1 m and A=1 m2, then R=ρ i.e., Resistance = Resistivity.
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