Two parallel circular plates,each with a radius of 
And carrying equal-magnitude surface charge densities of 
Are separated by a distance of 
With only air between them.How much energy is stored in these plates? (ε0 = 8.85 × 10-12 C2/N ∙ m2)
A) 78 nJ
B) 25 nJ
C) 7.9 nJ
D) 250 nJ
Correct Answer:
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