IIT JEE , AIEEE Forum - Physics , Electricity

anishseth

IF WE JOINED TWO RESISTANCE IN SERIES R(1) AND R(2) THE TOTAL RESISTANCE IS R(1)+R(2) WHAT IS THE RESULTED RESISTIVITY.

sinha0109

rate me!!!!!!!
resistivity isa constant whish only depends upon the nature of the material.so when you join two resistances the concept of net resistivity is theoretically not defined.but mathe matically if both the resistors have same cross section&area the net resistivity will be
(R1+R2)A/L.THIS EXPRESSION IS PHYSICALLY NOT VALID ASIT VIOLATES THE CONCEPT ORESISTIVITY

Mr.IITIAN007

If u join them in series ...the total resistivity is the algebraic sum of their individual resistivities ....but if u join them in parallel ...the net resistivity is
half of the H.M. ( thats right harmonic mean ) of their individual resistivities .

paulparthapratim2

The resistivity is defined as the resistance of a wire of unit length and unit cross section. It is a constant of the material and so there shall be no effect whether we connect 2, 3 4 wire in series.

isomniac

i do feel or i know tht resisitivity is a constant

i dont know why iitian2007 is adding them when it is a intensive property

only depends upon material

krishna.gopal

Resisitivity is a material property. If both resistances are made of same material then there resistivity is same as earliar. If they are made of two different material then there is no concept like resistivity of system. We will say resitivity of first is rho1 and that of second is rho2.

sinha0109

agreed krishna.gopal.my salute to u

pantpranav

Resistivity depends on the material.

There's no such system to add resistivity.

abhishek00

Resistivity is intensive property of the material,it is independent of quantity , shape & size of the material

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