Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

JEE Class main Answered

derive the expression for conductivity in terms of resistivity using ohms law
question image
Asked by yuvarajgududuru | 30 Oct, 2023, 09:32: AM
answered-by-expert Expert Answer
If R is resistance of conductor , V is volatge across conductors when current I is passing through it, then by Ohm's law
 
begin mathsize 14px style R space equals space V over I end style ................................ (1)
 
Resistance in terms of resistivity ρ is
 
begin mathsize 14px style R space equals space rho space cross times L over A end style ..............................(2)
where L is length of conductor and A is area of cross section.
 
From (1) and (2) , we have
 
begin mathsize 14px style rho space cross times space L over A space equals space V over I end style
begin mathsize 14px style rho space equals space A over L cross times V over I end style
 
Conductivity σ is reciprocal of resistivity , hence we get from above expression as
 
begin mathsize 14px style sigma space equals space L over A space cross times I over V end style  ..............................(3)
From above expression conductivity of material of conductor can be determined by applying a voltage V across conductor ,
by measurring current I pass through it and from the known values of length L and cross section area A .
 
 
 
 
 
 
Answered by Thiyagarajan K | 30 Oct, 2023, 10:53: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
JEE main - Physics
find current
question image
Asked by arivaryakashyap | 23 Apr, 2024, 10:40: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
three bulbs are connected in series after two bulbs s key is connected in parallel then what will be the total power p is?
question image
Asked by avneetsingh09 | 09 Mar, 2024, 01:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
s
question image
Asked by sahumonu473101 | 25 Jan, 2024, 10:12: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
derive the expression for conductivity in terms of resistivity using ohms law
question image
Asked by yuvarajgududuru | 30 Oct, 2023, 09:32: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
  Earthing provides a safety measure for electrical circuits and appliances. A thick metal plate is buried deep into the earth and thick wires are drawn from this plate; these are used in buildings for the purpose of earthing near the mains supply. Why only "thick" wire and "thick" metal plates are used?
Asked by aaryamanmodern | 21 Aug, 2023, 10:43: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
Sir the ans to this quesn is i3=-5/6 A so this means curretn flows from A to D (opp to current indicated in diagram) but through KVL we found PE at D is always greater than A, C,E hence it will always flow from D to other points. 1) How it is voilating Ienter=Iexit. 2)How current flows from A to D even though D is high PE?  
question image
Asked by aaryamanmodern | 22 Jun, 2023, 03:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
what kind of instrument is used in suspension monitor of car and bikes?based on meter bridge.
Asked by ojasgarg96 | 26 Dec, 2022, 09:55: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
 do kirchoff current and junction rules apply on circuit containg bothcapacitors and resistors ?
Asked by ojasgarg96 | 25 Dec, 2022, 10:10: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
will the invention of room temperature superconductor will make the current understanding of register useless?
Asked by ojasgarg96 | 25 Dec, 2022, 10:26: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
JEE main - Physics
why doesn't every metal becomes superconductor at low temperature?based on resistivity,how?
Asked by ojasgarg96 | 24 Dec, 2022, 01:28: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×