Here I will use Howells form of (4-8) : 25Aug2015 re-start equation entry at Lucas04_13 /$ 04_08 Bi(r,v,t) = (v/c)E0(r,t) ; Check 04_08 Bi(r,v,t) = (v/c)Ei(r,t) ; /%^% BIodv(POIo,t) = (Vonv(PART)/c)E0odv(POIo,t) ; BIodv(POIo,t) = (Vonv(PART)/c)EIodv(Rocv(POIo),t) ; /* This still leaves the static component of B as per (4-11) /$ B(r,v,t) = B0(r,t) + Bi(r,v,t) /%^% BTodv(POIo,t) = B0odv(POIo,t) + BIodv(POIo,t) /****where B0 is dropped as it "... is not electrostatic in nature ..." (p67h0.4) 02Jan2016 Note : There is no magnetic particle in the system, so B0 = 0 Actually Im confused p67h0.3 PROBLEM - When is an induce field "real"? see the 6 equations in Lucas p64 Generalized Amperes Law -> "v" will be very different for different reference frames. - If I assume that the Bi field is the same in all reference frames, then v is a velocity relative to WHAT? - Presumably it must be relative to the E0 field? From this, I conclude that Equation 1 - implies that the B field DOES depend on the observer frame! So if : - you moved with a point charge, you would see NO B induced field? - a very high-speed passing observer would see arbitrarily large B fields? - many observers moving past the point at different relative velocities will see different B fields Weird, I didnt think of these things. Reminds me that a constant current in a wire has a B field, but no E field (which I hadnt thought of)! Use same functional form for B0 & Bi? This has to be verified and justified! given the induced versus static B fields. /$ B(r´,t´) = (v/c)E0(r´,t´) + (v/c)Ei(r´,t´) = (v/c)[ E0(r´,t´) + Ei(r´,t´) ] /%^% BTodv(POIp(t),t) = (Vonv(PART)/c)E0odv(Rpcv(POIp),t´) + (Vonv(PART)/c)EIodv(Rpcv(POIp(t),t) = (Vonv(PART)/c)[ E0odv(Rpcv(POIp),t´) + EIodv(Rpcv(POIp(t),t) ] /*++++++++++++++++++++++++++++++++++++++ /*add_eqn "Question 04_13rev1 Total B magnetic flux density as induced from E0 + Ei /$ B(r´,t´) = Bi(r - v*t,t) = (v/c)[ E0(r´,t´) + Ei(r´,t´) ] /%^% BTdv(POIp(t),t) = Vonv(PART)/c[ E0pdv(POIp) + (EIpdv(POIp)=0) ] ??? /* ( OK simple, but I have questions. 10Jan2016 I assume B0 doesn't appear as there is no "other background" B source - eg permanent magnet of other [charges, currents]. Or is B0 from E0? PROBLEM - When is an induce field "real"? - depends on relative velocities so different observers at different relative velocities see different B fields at the same Point of Interest (POI)!!??