First slide

Electrostatic potential energy

Question

What is the potential energy of the equal positive point charges of $1 μC$ each held 1 m apart in air

Easy

A

$9 \times 10^{- 3} J$
B

$9 \times 10^{- 3} eV$
C

$2 eV / m$
D

Zero

Solution

Bu using $U = 9 \times 10^{9} \frac{Q_{1} Q_{2}}{r}$
$\Rightarrow U = 9 \times 10^{9} \times \frac{10^{- 6} \times 10^{- 6}}{1} = 9 \times 10^{- 3} J$

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