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  4. Given a current carrying wire of non uniform cross section. Which of the following is constant throughout the length of the wire?

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Q. Given a current carrying wire of non uniform cross section. Which of the following is constant throughout the length of the wire?

AIIMSAIIMS 2000

Solution:

In steady state condition the current at each cross-section will be the same. Drift velocity and electric field depend on the current density, $\bar{M}$ which varies from one crosssection to another.