Physics · Electric current: drift velocity, mobility and their relation with electric current
A steady current flows in a metallic conductor of non-uniform cross-section. The
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is /are
- A. current, electric current and drift velocity
- B. drift speed only
- C. current and drift speed only
- D. current only
Step-by-step solution
In a metallic conductor with non-uniform cross-section, the current (rate of flow of charge) is constant along the length due to conservation of charge. Drift speed depends on cross-sectional area (v_d = I/(n e A)), so it varies when area changes. Thus, only current remains constant.
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