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

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Current

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Currently density

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None of these

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Solution

The correct option is B Current
When a steady current flows through a metallic conductor of non-uniform cross-section, then drift velocity
$V_{d} = \frac{I}{e n A}$ or $V_{d} \infty \frac{1}{A}$

$E = \frac{I}{σ A}$ or $E \infty \frac{1}{A}$
Both $V_{d}$ and $E$ change with $A$ , only current $I$ remains constant.

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A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?

The correct option is B CurrentWhen a steady current flows through a metallic conductor of non-uniform cross-section, then drift velocityVd=IenA or Vd∞1AE=IσA or E∞1ABoth Vd and E change with A, only current I remains constant.