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  4. Consider the figure, cross-sectional area of conductor at A and B is 2a and a respectively. Current density at A and B are given by JA and JB then JA/JB is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/a7a7c48dd11cc3ad11f3b4c85ff5e870-.png />

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Q. Consider the figure, cross-sectional area of conductor at A and B is $2a$ and a respectively. Current density at A and B are given by $J_A$ and $J_B$ then $J_A/J_B$ is
image

Current Electricity

Solution:

Current flowing through the resistor will be same throughout
$\& J \propto \frac{1}{ A }$