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  • Two cylindrical rods of the same cross-sectional area and same length are connected in series to an ideal cell as shown. The resistivity of the left rod is <img alt="\rho" src="https://entrancecorn

Two cylindrical rods of the same cross-sectional area and same length are connected in series to an ideal cell as shown. The resistivity of the left rod is \rho  and that of the right rod is 2 \rho. Then the variation of potential at any point P at a distant x  from the left end of the combined rod system is given by which graph

  

 

Option: 1

a


Option: 2

b


Option: 3

c


Option: 4

d


Answers (1)

best_answer

From relation E=\rho \mathrm{J}, the magnitude of electric field is greater in right rod as compared to left rod. Therefore, magnitude of potential gradient in the right rod is greater

Also the graph of potential variation with distance is continuous 

Therefore, the variation is shown by the figure.

 

Posted by

Rakesh

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