Consider a temn mode in a rectangular waveguide. find the time-averaged poynting vector(s) and energy density 〈u). integrate over the cross-section of the waveguide to obtain the energy per unit time and the energy per unit length carried by the wave. calculate their ratio. confirm that the energy in the mode travels at the group velocity vg - do/dk.

Where do magnetic lines of force enter earth?

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward

Ihave this 50 question test the layer of earth's atmosphere where atoms and molecules escape into space is referred to as the a) exosphere b) ionosphere. c) mesosphere d) thermosphere