A Parallel Plate Capacitor Has Air in Between the Plates,which $\times$

A parallel plate capacitor has air in between the plates,which are circular with radius 0.07 m.The separation gap is 0.375 mm.What is the maximum energy that can be stored in this capacitor if air-breakdown is to be avoided? The breakdown threshold field is approximately 3 $\times$ 10⁶ N/C.

A) 7.3 $\times$ 10^-6 J
B) 2.3 $\times$ 10^-5 J
C) 4.6 $\times$ 10^-5 J
D) 6.1 $\times$ 10^-3 J.

Correct Answer:

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