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Two opposite charges, each of magnitude $10^{-9} \mu C$ are seperated by a distance 9 m. The electric potential at a point mid way between them is
Difficulty: Easy
A: 
2 V
B: 
0
C: 
$9 \times 10^{-9} V$
D: 
$9 \times 10^{9} V$
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