Dielectric Strength problem. Please Help! :( If anyone can let me know if I went about this right, I'd appreciate it, as well as any advice. The dielectric strength of an insulating material is the maximum electric field strength to which the material can be subjected without electrical breakdown occuring. Suppose a parallel plate capacitor is filled with a material whose dielectric constant is 3.5 and whose dielectric strength is 1.4 E 7 N/C. If this capacitor is to store 1.7 E -7 C of charge on each plate without suffering breakdown, what must be the radius of its circular plates? I started with the equation E=Q/Eo*k*A, then found that A=Q/Eo*k*E. I then plugged the numbers into this equation to get 2.3E-7/8.85E-12(3.5)(1.4E7). Is this the right way to do this problem or do I need to do something differently, as I'm not sure if the radius they're looking for could be found with the Area I got?