If the magnitude of the electric field in air exceeds roughly 3 × 106 N/C, the air breaks down and a spark forms. For a twodisk capacitor of radius 51 cm with a gap of 2 mm, if the electric field...

If the magnitude of the electric field in air exceeds roughly 3 × 106 N/C, the air breaks down and a spark forms. For a twodisk capacitor of radius 51 cm with a gap of 2 mm, if the electric field inside is just high enough that a spark occurs, what

is the strength of the fringe field just outside the center of the capacitor?