Electronics and Communication Engineering - Materials and Components - Discussion
Discussion Forum : Materials and Components - Section 1 (Q.No. 13)
13.
The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Answer: Option
Explanation:
It is another form of Ohm's law.
Discussion:
5 comments Page 1 of 1.
M.A.Salam said:
9 years ago
Hi, I don't know eight forms of ohm's law but as far as possible I can discuss.
We have ohm's law,
I = V/R. Where I = current, V = voltage and R = resistance.
But,
Current density j = I/A.
Conductance G = 1/R.
So, it can be written as I = G * V.
Now we can replace G = sigma,V = E & I proportional current density 'j'.
So, j = sigma *E.
We have ohm's law,
I = V/R. Where I = current, V = voltage and R = resistance.
But,
Current density j = I/A.
Conductance G = 1/R.
So, it can be written as I = G * V.
Now we can replace G = sigma,V = E & I proportional current density 'j'.
So, j = sigma *E.
(1)
Jujube said:
5 years ago
The vector form of the law used in electromagnetics and material science.
Where J is the current density at a given location in a resistive material, E is the electric field at that location, and σ (sigma) is a material-dependent parameter called the conductivity. This reformulation of Ohm's law is due to Gustav Kirchhoff.
Where J is the current density at a given location in a resistive material, E is the electric field at that location, and σ (sigma) is a material-dependent parameter called the conductivity. This reformulation of Ohm's law is due to Gustav Kirchhoff.
Ramky said:
1 decade ago
Totally we are having 8 forms of ohm's laws, this is one of them.
Sowmiya said:
7 years ago
J= σ E.
q=CV.
V=IR.
V=I di/dr.
I=c dv/dr.
R=pl/a.
C= A/d.
q=CV.
V=IR.
V=I di/dr.
I=c dv/dr.
R=pl/a.
C= A/d.
(1)
KIRTI ARORA said:
1 decade ago
Please tell all 8 forms of Ohm's law.
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