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Assertion: The resistivity for a substan...

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 false

D

If the assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
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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