A parallel plate capcitor is formed by two discs with a unifrom poorly conducting medium between them. The capacitor was initally charged and then disconnected form a voltage source. Neglecting the edge effects, show that there is no magnetic field between capcitor plates.

Explanation

Here also we see that negelecting edge effects `vec(j_(d)) = -vec(j)`. Thus Maxwell's equactions reduce to, div `vec(B) = 0`, curl `vec(H) = 0, vec(B) = mu vec(H)`
A general soultion of this equaction is `vec(B)` = constant `= vec(B_(0)) . vec(B_(0))` can be thought of as an extraeous magnetic field. If it is zero, `vec(B) = 0`