x府=j-H=JH=J儿 95_H=E=HL- vxm=6要-些Ho-县- t L t 2 2 Herror._8JL3_8uL2-L☑ M2之（c2C quasistatic Figure 3.4.1 Range of characteristic times over which quasistatic approximation is valid.The transit time of an Tem 入 electromagnetic wave is Tem while r?is a time characterizing the dynamics of the quasistatic system. Courtesy of Hermann A.Haus and James R.Melcher.Used with permission. L =LVEH Tem =C 6.641,Electromagnetic Fields,Forces,and Motion Lecture 3 Prof.Markus Zahn Page 4 of 126.641, Electromagnetic Fields, Forces, and Motion Lecture 3 Prof. Markus Zahn Page 4 of 12 H H J J H JL L ∇× = ⇒ = ⇒ = 2 H E H HL JL E E t L ∂ µ µµ ∇ × = −µ ⇒ = ⇒ = = ∂ τ ττ 3 error error error 2 2 E E EL JL H H H t L ∂ µ ∇× = ⇒ = ⇒ = = ∂ τ τ τ ε εε ε ( ) 3 22 error 222 H JL L L 1Lc H JL c µ µ = == ⇒τ τ τ τ ε ε   Courtesy of Hermann A. Haus and James R. Melcher. Used with permission. em L L c τ== µε