A $0\mathrm{.}200-$A current is charging a capacitor that has circular plates $8\mathrm{.}0$ cm in radius. The plate separation is $4\mathrm{.}00$ mm$.$

$($a$)$ What is the time rate of increase of electric field between the plates?

V$/($m$$s$)$

$($b$)$ What is the magnetic field between the plates $5\mathrm{.}00$ cm from the center?

T