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  4. Calculate the potential at a point P due to a charge of 4 × 10-7 C located 9 cm away

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Q. Calculate the potential at a point $P$ due to a charge of $4 \times 10^{-7}$ C located $9\, cm$ away

Electrostatic Potential and Capacitance

Solution:

$V=\frac{1}{4 \pi \varepsilon_{0}} \cdot \frac{Q}{r} $
$=9 \times 10^{9} Nm ^{-2} C ^{-2} \times \frac{4 \times 10^{-7}}{0.09 m } C$
$=4 \times 10^{4} V$