Assertion: The resistivity for a substance is its resistance when its is one meter long and its area of cross section is one square meter. Reason: The SI units of resistivity are ohm metre `(Omega" "m)` and ohm centimeter `(Omega" "cm)`A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If the assertion and reason both are false.

Assertion: The resistivity for a substance is its resistance when its

1.	Assertion: The resistivity for a substance is its resistance when its is one meter long and its area of cross section is one square meter. Reason: The SI units of resistivity are ohm metre `(Omega" "m)` and ohm centimeter `(Omega" "cm)`A. if both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is falseD. If the assertion and reason both are false.
Answer» Correct Answer - B We know, `Rprop(1)/(A)` orr `R=rho((l)/(A))`, where proportionality constant `rho` is called resistivity. If l=1m and A=`1m^(2)`, then `R=rho` i.e., resistance=Resistivity.

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What are elementary reactions ?

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