Point A is a distance L to the left of a charge Q. Point B is adistance 3L to the left of point A. If the electric field atpoint A due to charge Q is E, what is the electric field atpoint B?[img=277x49]17da660b2a21250.png[/img]
A: E/3
B: E/9
C: E
D: 3E
E: E/16
A: E/3
B: E/9
C: E
D: 3E
E: E/16
举一反三
- 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.
- 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
- The<br/>Biot-Savart Law is used to A: determine<br/>the electric field created by individual point charges B: determine<br/>the electric field created by an electric current C: determine<br/>the magnetic field created by individual point charges D: determine<br/>the magnetic field created by an electric current E: determine<br/>the force field created by an electric current
- There are two point-charges<br/>q1<br/>and q2.<br/>The magnitude of electric field force between them is F. If the third<br/>point charge +Q is<br/>introduced, will the force between q1<br/>and q2<br/>be influenced by +Q<br/>[ ] A: It will not be influenced by +Q B: It will be influenced by +Q
- Electric field lines A: are trajectories of a test charge B: are vectors in the direction of the electric field C: form closed loops D: cross each other in the region between two point charges E: are none of the above