Practice question · Select all that apply
Which statements about steady currents are correct?
Hints
- Three are equivalent statements of the steady condition; one contradicts it.
- If charge accumulated, the current could not be steady.
Show the answer
- B. The divergence of the current density is zero
- C. Current into a junction equals current out of it
- D. Ohmic conductors satisfy J equals sigma times E
Why
Steady means nothing accumulates, so , which is Kirchhoff’s junction rule in field form. Accumulation is exactly what steadiness forbids.
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