Current Density Relation
Mediumphysics
Current density J relates to conductivity σ and electric field E by?
Select the correct option:
Solution
Incorrect! Answer:
J = σ E
- Microscopic Form of Ohm's Law: While V=IR is macroscopic, J=σE describes conduction at a point.
- Definitions:
- J=I/A (Current density)
- E=V/L (Electric field)
- Derivation:
- V=IR⟹EL=JA×(ρL/A)
- EL=JρL⟹E=Jρ
- J=E/ρ
- Final Step: Since 1/ρ=σ, we get J=σE.
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About This Question
- Subject
- physics
- Chapter
- current electricity
- Topic
- current density relation
- Difficulty
- Medium
- Year
- 2025
This medium difficulty physics question is from the chapter current electricity, covering the topic of current density relation. It appeared in the 2025 exam. Practice this and similar questions to strengthen your understanding of current electricity concepts.
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