If the charge on a parallel-plate capacitor is doubled:
A: the capacitance is halved
B: the capacitance is doubled
C: the electric field is halved
D: the electric field is doubled
E: the surface charge density is not changed on either plate
A: the capacitance is halved
B: the capacitance is doubled
C: the electric field is halved
D: the electric field is doubled
E: the surface charge density is not changed on either plate
举一反三
- 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
- 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
- The force on the metal plate of parallel plate capacitor is A: longitudinal tension B: lateral pressure C: unable to confirm D: zero
- If the electric flux through a closed surface is 0, then there is no net charge inside the surface. A: 正确 B: 错误
- 中国大学MOOC: If the electric flux through a closed surface is 0, then there is no net charge inside the surface.