Search any question & find its solution
Question:
Answered & Verified by Expert
Two rods of copper and iron with the same cross-sectional area are joined at and a steady current flows through the rods as shown in the figure.
Choose the most appropriate representation of charges accumulated near the junction .
- A
- B
- C
- D
Solution:
1272 Upvotes
Verified Answer
The correct answer is:
When a current flows through a junction or a contact between two metals of different conductivities a charge is accumulated in the vicinity of contact. The charge accumulation is directly proportional to the current. Charge accumulation occurs in a region whose thickness is nearly equals to the mean free path in the metal.
In case current flows from a metal of large conductivity to a metal of small conductivity, charge accumulation is of positive type and vise-versa.
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.