A) Two parallel plates are connected to a 40 V battery. The distance between the

Question

A) Two parallel plates are connected to a 40 V battery. The distance between the two plates is 24 cm. What is the magnitude of the electric field between the two plates? in V/m

B) Two parallel plates, connected to a 70 V battery, are separated by an air gap. If the plates get close enough, the electric field will exceed the breakdown value of E for air. (A *spark* will occur!) We observe sparking between the plates when the distance is reduced to 18 cm, what is the breakdown value for the air? in V/m

Explanation / Answer

apply Electric field E   = V/d

E = 40/0.24

E = 166.67 N/C

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b. apply E = V/d

E = 70/0.18

E = 388.89 V/m

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