The poynting vector is the power per unit area, so to find the power we must integrate it over the area through which it travels. since it travels parallel to the inner current (oops, i just gave away half the answer to part we must integrate it over the washer-shaped area between the two cables, since that is the area through which the power flux passes. that is, that 2πrdr is the area of a little washer of radius r; the integral is in polar coordinates. if physics is right, then the total power transmitted in the fields (calculated from that integral) should exactly equal the amount of power being put into the cable by the battery. prove that physics is right. d) for reasons that cannot be explained here (google "oliver heaviside" and "telegrapher's equations for more info), the speed of em waves, and thus the speed at which the power travels, in a transmission line is v /wlc. plug in the formulas from above to find a simple formula for v in a coax. remember the "impedance matching" problem from exam 2? to deliver maximum power to the load, the impedance zo should match the load. for a coax cable just as for an lc circuit, ζ.- e) determine the ratio of outer to inner radius, b/a, for a coax so that its impedance matches a 75ω load resistor. the dielectric constant is 2.4, so ε 2.4eo, but it is not a magnetic material, so μ-10.

The necleus of an atom is made up of what subatomic particles?

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .

Question 1 what is amperage? is the rate of doing work. is the rate of flow of protons in electric current. represents the amount of pressure behind electron flow. is the rate of flow of electrons in electric current. 2 points question 2 what is voltage? is the rate of doing power. represents the amount of pressure behind electron flow. is the rate of doing work. is the rate of flow of electrons in electric current. 2 points question 3 what is power? is the rate of flow of protons in electric current. is the rate of flow of electrons in electric current. is the rate of doing work. represents the amount of pressure behind electron flow. 2 points question 4 if we multiply volts times amps we get what? power circuit work current 2 points question 5 what are two ways alternating currents are similiar? in both ac and dc electrons flow in the same pattern. in both ac and dc, the flow of electrons changes directions back and forth. both ac and dc are only possible in certain materials with atoms that will allow electron flow. both ac and dc involve the flow of electrons. 4 points question 6 how does the flow of electrons flow in an alternating current? the flow of electrons is always slower in an alternating current than within a direct current. the flow of electrons is not constant and forward; it changes direction back and forth. electrons flow from from a higher affinity to that of a lower affinity. electron flow is constant and only in a forward direction. 2 points question 7 what is the flow like in a direct current? the flow of electrons is not constant and forward; it changes direction back and forth. the flow of electrons is constant and only in a forward direction. the flow of electrons go from a higher affinity to a lower affinity. the flow of electrons are always faster in a direct current. 2 points question 8 how is an electric current able to flow? electrons flow from the higher affinity to lower affinity and electrical current is generated. protons flow from the higher affinity to lower affinity and electrical current is generated. the movement of protons from one atom to another leads to an electric charge. the movement of electrons from one atom to another atom in a line results in a flow of electric current. 2 points question 9 how do electrons move from the two different types of metal in a battery? protons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the lower affinity to the metal with higher affinity and electrical current is generated. electrons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated. protons flow from the metal with the higher affinity to the metal with lower affinity and electrical current is generated.