A parallel-plate air capacitor is connected to a constant-voltage battery. If th

Question

A parallel-plate air capacitor is connected to a constant-voltage battery. If the separation between the capacitor plates is doubled while the capacitor remains connected to the battery, the energy stored in the capacitor 1Not enough information is provided. 2becomes six times its previous value. 3drops to one-sixth its previous value. 4doubles. 5remains unchanged. 6drops to one-fourth its previous value. 7drops to half its previous value. 8drops to one-third its previous value. 9quadruples. 10triples.

Explanation / Answer

u = .5 c v^2

v = cte

c =k e(0) A/d ==> c 2 = .5 c1 ==> u2 = .5 u1

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