Home Physics Current Electricity JEE (Advanced) / IIT-JEE Problems (Previous Years) Two bars of equal resistivity ρ and radii 'r…
Physics Current Electricity JEE (Advanced) / IIT-JEE Problems (Previous Years) MCQ (Single Correct)

Two bars of equal resistivity ρ and radii 'r' and '2r' are kept in contact as shown. An electric current I is passed through the bars. Which one of the following is correct

A
Heat produced in bar is 2 times the heat produced in bar
B
Electric field in both halves is equal
C
Current density across AB is double that across BC.
D
Potential difference across BC is 4 times that across AB.

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Text Solution

Verified by Experts
The correct answer is:
D

=

V BC = 4V AB

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