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a4pat

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## Homework Statement

The electric field between two circular plates of a capacitor is changing at a rate of 1.5x10^6 V/m/s (ΦE). If displacement current at this instant is Id=0.80x10^-8A, find the dimensions of the plates.

## Homework Equations

Id=ΔQ/Δt=εΔΦE/Δt

Q=CV=(εA/d)(Ed)

Q=εAE <-- need to solve for A but do not have E.

## The Attempt at a Solution

Q=εΦE = (8.85x10^-12)(1.5x10^6)

Q=1.33x10^-5

Feel like I must be missing something, I've gone over this problem and relevant formulas for way too long and can't figure out how to determine A (area of the plates) from the information given. Would really appreciate a push in the right direction.

Thanks

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