Part 4 - Solve Estimate To use the relation from Part 3, you need to know the field for dielectric breakdown in air. What is a reasonable estimate for Ebreakdown? 3.0e6 Good. V/m Calculations (use your estimate) Using your estimate for Ebreakdown, what is the magnitude of the potential difference between the doorknob and the finger? 640 Please check your arithmetic, and be sure to express L in meters. V