MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping
Menu
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details
Get extra R 840 off
USE CODE: asknikunj

				   

microscopic form of ohms law

5 years ago

Share

Answers : (1)

										

Dear Harpreet Singh,


Ohm's Law is the linear proportionality between current and voltage that occurs for most conductors of electricity. A graph of voltage against current is a straight line. The gradient is the resistance.


The most well known form of Ohm's law is V=IR, where V is the voltage, I is the current and R is the resistance. However there is another form of Ohm's law which often used by physicists that operates on a microscopic level, relating the current density J to the conductivity σ and the electric field, E.


To see how consider, the volume of material with faces of area A a distance l apart. With an e.m.f. V across the faces of the material



  • the current is proportional to the voltage V

  • the current is proportional to the surface area A

  • and the current is inversely proportional to the distance l.


The current is therefore,


I = VAσ/l.


R = l/Aσ


The proportionality constant σ is the conductivity of the material.


V/l = |E|, and J = I/A in the direction of E so in general we have the constitutive relation.


J = σE


 


                      Good Luck!!!!!!


 


 Plz. approve my answer, if you loved it, by clicking 'Yes' given below!!!!!!Plz. Plz. Plz.!!!!!!! Don't forget!!!!!!!!Smile

5 years ago

Post Your Answer

Other Related Questions on Electric Current

Can you explain the method of equipotential for solving complex circiuts
 
 
@ HARSHIL equipotential surface is that surface in which the value of potential at every point of that region will be of equal value.. here , the work done for moving a charge from one...
 
Umakant biswal 9 months ago
 
Please post some questions related to this as it is very difficult to tell u the method as a theory....in equipotential method we just write symmetric paths and choose equipotential based...
 
Himanshu 9 months ago
what is modern physics?.tell me brieflt about for eletric circuit???
 
 
physics is branch of science its deals with the science. now a days physics is called physics is called modern.
 
T.kumar 7 months ago
 
dear chetan..Modern physics is an effort to understand the underlying processes of the interactions of matter utilizing the tools of science & engineering. It implies that nineteenth century...
 
mohan 7 months ago
 
hi chethan modern physics means physics based on the two major break throughs of the early the twentieth century relativity and quantum mechanics.physics based on what was known before then ...
 
manichandra 7 months ago
what is electric flux? and explain it?
 
 
Dear Manjunath In electromagnetism, electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of electric field lines...
 
Prabhakar ch 7 months ago
 
hallo manjunath Gauss's Law is a general law applying to any closed surface electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to ...
 
raj 7 months ago
 
Gauss's Law is a general law applying to any closed surface electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of...
 
sudarshan 7 months ago
We all know that the nucleus of Fe is most stable. So whenever a nuclear fission occurs, one of the daughter nuclei must be Fe in order to increase stability. Then why is it not so??
 
 
study how nuclear fission occurs then you will get your answer.
 
akash one year ago
 
study how nuclear fission occurs then you will get your answer.
 
pa1 11 months ago
what is a magnet and uses explain
 
 
Magnets are also used in other types of fastening devices, such as the magnetic base, the magnetic clamp and the refrigerator magnet . Compasses: A compass (or mariner's compass) is a...
 
SHANMUKESHWAR 11 months ago
 
A magnet (from Greek μαγνήτις λίθος magnḗtis líthos , " Magnesian stone") is a material or object that produces a magnetic field . This magnetic field is invisible but is responsible for...
 
RAKESH CHINDAM 11 months ago
 
Magnets are also used in other types of fastening devices, such as the magnetic base, the magnetic clamp and the refrigerator magnet. Compasses: A compass (or mariner`s compass) is a...
 
L GOUSE BASHA 11 months ago
why quantisation of charge has no significance at macroscopic level?
 
 
We know that every charge is a integral multiple of e (=1.6 * 10^(-19) C). While we dealing with charger like 1 microcolumb(order of magnitude of -6) or even nano columb this fact is not...
 
Ajmal Pt one year ago
 
bcause
 
shubham khanna one year ago
View all Questions »

  • Complete Physics Course - Class 12
  • OFFERED PRICE: R 2,600
  • View Details
Get extra R 780 off
USE CODE: asknikunj

  • Complete Physics Course - Class 11
  • OFFERED PRICE: R 2,800
  • View Details

Get extra R 840 off
USE CODE: asknikunj

More Questions On Electric Current

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details