A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?
Drift speed
Current
Currently density
None of these
A
None of these
B
Drift speed
C
Currently density
D
Current
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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 Vd∞1A
E=IσA or E∞1A
Both Vd and E change with A, only current I remains constant.
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