(a) One way to fill in the “missing link” in Fig. 5.48 is to exploit the analogy between the defining equations for A (viz. ∇ · A = 0, ∇ × A = B) and Maxwell’s equations for B (viz. ∇ · B = 0, ∇ × B = μ0J). Evidently A depends on B in exactly the same way that B depends on μ0J (to wit: the Biot-Savart law). Use this observation to write down the formula for A in terms of B.
(b) The electrical analog to your result in (a) is
Derive it, by exploiting the appropriate analogy.
Figure 5.48
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