KCET 2025 Physics Paper

In a steady-state circuit the charge per second crossing any section must be the same, so the current $I$ is constant. However, for a non-uniform wire:- Drift speed$v_d=\;\frac{I}{n q A}$depends on the local cross-sectional area $A$, so $v_d$ varies. - Electric field$E=\rho J=\rho \;\frac{I}{A}$also varies with $A$.Therefore only the current remains the same throughout.Answer: Option C (Current only).