1. Properties of conductor under electrostatic equilibrium

2. Briefly describe Lenz's law

3. Self-feeling:

The phenomenon of induced electromotive force in conductor circuit due to the change of induced current.

4. Mutual inductance:

Because the current in one conductor loop changes, induced electromotive force is generated in the adjacent conductor loop.

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5. Electric dipole:

Two equal point charges with different signs are +q and-Q. The distance is L. If the field points for calculating the electric field intensity are all relative to this one.

The charging distance r is much greater than l (r >; > This pair of point charges is called electric dipole.

6. Two basic hypotheses of special relativity

7 Classification of magnetic media

8. Briefly describe the Hall effect:

A metal conductor or semiconductor with current I is placed in a uniform magnetic field with magnetic induction intensity B to make the magnetic field square.

If the direction is perpendicular to the current direction, there will be a potential difference Uab between the two surfaces A and B perpendicular to the magnetic field and the current direction.

This phenomenon is called the Hall effect.

9. Conditions for Coherence of Two Beams of Light

Light waves with the same frequency, parallel vibration directions of light vectors and constant phase difference meet.

10. huygens-fresnel principle, etc.