Q. 24.8( 4 Votes )

Two resistors A a A. ρA > ρB

B. ρA = ρB

C. ρA < ρB

D. The information is not sufficient to find the relation between ρA and ρB.

Answer :

Given :


Resistance of resistor A, RA< Resistance of resistor B, RB


Formula used : Resistance is given by the formula



Where


R is the resistance


ρ is the resistivity


l is the length


A is the area of cross section


Resistance is



Resistance is



Only the relation between resistance values of and is given. R is depends on ρ, l and With the information given we cannot conclude the relation between resistivity of the two resistors.


If information about ρ, l and A is given then we can say the relation between ρA and ρB. So option D is correct.

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