Answer Happy

1) The condition of that vectors A and B are perpendicular to each other is and the condition that they are parallel to each other is 2) Given the potential function Q = 2 px? + 4y2 +2 , , its gradient expression is and the expression of the electric field strength vector at the coordinates (1,0,1) is 3) The differential form of Ohm's law in a conducting medium with conductivity y 15 and the current continuity differential equation for a constant electric field can be expressed as 4) In a constant magnetic field, when there is no current at the interface between the two media, the normal boundary condition of the magnetic induction intensity is and the tangential boundary condition is 5) A parallel plate capacitor, the distance between the two plates is d, and is filled with a dielectric with permittivity e between the two plates. Now a alternating voltage u = U, sin ot is applied to both ends of the capacitor, the displacement current density between the capacitor plates is 6) In the time-varying electromagnetic field, due to the continuous change of electric field and magnetic field, an electromagnetic wave propagating in space and carrying electromagnetic energy is formed. We can use