Question

As a parallel-plate capacitor with circular plates 20 cm in diameter is being charged, the current density of the displace-ment current in the region between the plates is uniform and has a magnitude of 20 A/m^2. Calculate the magnitude B of the magnetic field at a distance r=50 mm from the axis of symme-try of this region. (Answer: 0.63 uT)

Answer 1

Use the generalisation of Ampère's theorem to non stationary currents.

Answer 2

\(2\pi rB(r)=\mu_oj\pi r^2\)

Answer 3

What's the value of J?

Answer 4

20 A/m^2

Answer 5

Got to go now. I think your problem is solved.

Answer 6

Thanks. I'll try the problem.