A: The tangent direction at each point on it is orthogonal to the direction of the vector field at that point.
B: The tangent direction at each point on it is parallel to the direction of the vector field at that point.
C: The value of each point on it is equal to the value of the vector field at that point.
D: The vector line is the geometric curve of the vector field function.
举一反三
- Which of the following statements is wrong about curl? A: The curl of a vector field is a scalar and a function of the spatial coordinate points. B: At a certain point M in the field,[img=84x28]1803b721c59068a.png[/img] means that the vector line of this point is spinning. C: At a certain point M in the field,[img=84x26]1803b721cd97fe6.png[/img] means that the vector line of this point is spinless. D: Curl have the dimension of circumferential area density.
- The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- If F is a vector field, then divF is a vector field.
- Vector line equation of vector field [img=153x30]1803b7224204019.png[/img] passing through point M(1,2,3) ( ) A: [img=53x22]1803b72249c008c.png[/img] B: [img=59x22]1803b722521410c.png[/img] C: [img=166x29]1803b7226023f4c.png[/img] D: [img=78x51]1803b7226872e38.png[/img]
- 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.
内容
- 0
The vector line equation of the vector field [img=408x30]1803b720e914a89.png[/img] is( ) A: [img=348x26]1803b720f3ee3da.png[/img] B: [img=304x26]1803b720fb4275c.png[/img] C: [img=304x48]1803b721069f000.png[/img] D: [img=275x48]1803b7210f9d574.png[/img]
- 1
磁场中某点的磁感应强度的方向（ ）Direction of magnetic flux density at a point is ( ) A: 放在该点的通电直导线所受的磁场力的方向The direction of the magnetic force on the current-carrying placed at this point B: 放在该点的正检验电荷所受的磁场力的方向The direction of the magnetic force on the positive charge placed at this point C: 放在该点的小磁针静止时N极所指的方向The direction of N pole when the small magnetic needle placed at this point is stationary D: 通过该点磁场线的切线方向Tangent direction of magnetic field line at this point
- 2
Both electric field E and electric potential V can describe the characteristics of a field. If the electric potential at a certain point is zero, the electric field at that point has to be zero.
- 3
The Biot-Savart Law is used to（ ） A: determine the magnetic field created by an electric current B: determine the electric field created by an electric current C: determine the force field created by an electric current D: determine the magnetic field created by individual point charges E: determine the electric field created by individual point charges
- 4
Known a scalar function [img=108x26]1803b72075a8d3c.png[/img], vector [img=136x30]1803b7207e4da5d.png[/img] , then the directional derivative of the scalar function [img=11x14]1803b720860ea18.png[/img] at point (2,-1,1) along vector [img=6x19]1803b7208dcaa57.png[/img] is ( ) A: 1 B: -1 C: [img=9x43]1803b72094edd3a.png[/img] D: [img=25x43]1803b7209ca0410.png[/img]