The boundary condition of the electric field intensity of steady electric fields is
A: the normal components are continuous.
B: the tangential component are continuous.
C: if there is no current at the interface, the tangential components are continuous.
D: both the tangential and normal components are continuous.
A: the normal components are continuous.
B: the tangential component are continuous.
C: if there is no current at the interface, the tangential components are continuous.
D: both the tangential and normal components are continuous.
举一反三
- On the surface of a perfect conductor, the normal component of the electric displacement vector is A: continuous with the normal component of the electric displacement vector inside the conductor B: uncertain C: equal to the surface density of free charge on the conductor surface. D: equal to zero
- Which is false? A: Streamlines and equipotential surfaces are perpendicular everywhere. B: Streamlines point from the position with lower potential to the position with higher potential. C: Streamlines do not intersect. D: The tangential direction of the streamline is the direction of the electric field intensity at the point.
- Which of these is NOT a tense? ( ) A: The present continuous B: The past perfect C: The future perfect continuous D: The passive
- At different loads the feed flow should be A: changed B: continued C: accommodated D: maintained continuous steady
- Under normal circumstances, the primary urine in the cavity of the glomerular capsule contains:() A: All plasma components B: All blood components C: Plasma components other than macromolecular proteins D: All plasma components other than organic matters E: All blood components other than erythrocytes