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Question

A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?
  1. Drift speed
  2. Current
  3. Currently density
  4. None of these

A
None of these
B
Drift speed
C
Currently density
D
Current
Solution
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When a steady current flows through a metallic conductor of non-uniform cross-section, then drift velocity
Vd=IenA or Vd1A

E=IσA or E1A
Both Vd and E change with A, only current I remains constant.

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