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7. Assuming conservation of volume, we find the radius of the combined spheres, then
use
C
= 4
π
ε
0
R
to find the capacitance. When the drops combine, the volume is doubled. It
is then
V
= 2(4
π
/3)
R
3
. The new radius
R'
is given by
()
3
3
44
2
33
RR
′
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 Spring '08
 Any
 Physics, Capacitance

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