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## Homework Statement

A 0.450 A current is charging a capacitor that has circular plates 14.0 cm in radius.

(a) If the plate separation is 4.00 mm, what is the time rate of increase of electric field between the plates? Answer: 8.26e5 MV/m/s

(b) What is the magnitude of the magnetic field between the plates 5.00 cm from the center?

## Homework Equations

Maxwell's Equations, Ampere's Law, Biot-Savart Law

## The Attempt at a Solution

(a) To solve this, I used the following process:

V = Ed = [tex]\frac{Q}{C}[/tex] [tex]\Rightarrow[/tex] E = [tex]\frac{Q}{Cd}[/tex]

[tex]\frac{dE}{dt}[/tex] = [tex]\frac{I}{Cd}[/tex] = [tex]\frac{I}{(\frac{\epsilon_{0}A}{d})d}[/tex] = [tex]\frac{I}{\epsilon_{0}A}[/tex]

(b) I really have no clue, but I would appreciate some help...

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