μ0φ=q\mu_{0} \varphi=qμ0φ=q
μ0q=φ\mu_{0} q=\varphiμ0q=φ
t0q=φt_{0} q=\varphit0q=φ
q=ϕϵ0q=\phi \epsilon_{0}q=ϕϵ0
