Question:
Electric field and current density have relation
Electric field and current density have relation
Updated On: Jul 27, 2022
- $E \propto J$
- $E \propto J^2$
- $E \propto \frac {1}{j^2}$
- $E^2 \propto \frac {1}{j}$
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The Correct Option is A
Solution and Explanation
Current density relates with electric field as
$J=\sigma \, E=\frac {E}{p}i$
where $\sigma$ =conductivity and p= resistivity or specific resistance of substance.
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter