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Two bars of equal resistivity rho and ra...

Two bars of equal resistivity `rho` and radius 'r' and '2r' are kept in contact as show. An electric current is passed through the bars. Which one of the following is correct ?

A

Heat produced in bar (1) is 2 times the heat peoduced In bar (2)

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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The correct Answer is:
D
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