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A point charge of $4$ nC creates potential at $0.2$ m of:
A$36$ V, the product of $kQr$ rather than $kQ/r$ here
B$180$ V, by $V = kQ/r$ with the standard constant
C$720$ V, ignoring the distance entirely in the formula
DZero, since $V$ depends only on enclosed charge always
Answer & Solution
Correct answer: B. $180$ V, by $V = kQ/r$ with the standard constant
$V = 9\times 10^9\cdot 4\times 10^{-9}/0.2 = 180$ V.
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