Assuming potential energy at infinite separation is zero, what is the Potential Energy of a two charge system if the charges are both +10C and are separated by 10m?

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Solution

The correct option is B
The question has asked us to assume potential energy at infinity to be zero. Then we know by definition, the potential energy of a system of 2 charges at a distance r is given by,
$P E = \frac{k Q p}{r} I n t h i s c a s e, P E = \frac{9 \times 10^{9} \times 10 \times 10}{10} P E = 9 \times 10^{10} J$

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Assuming potential energy at infinite separation is zero, what is the Potential Energy of a two charge system if the charges are both +10C and are separated by 10m?

The correct option is B The question has asked us to assume potential energy at infinity to be zero. Then we know by definition, the potential energy of a system of 2 charges at a distance r is given by, PE=kQprIn this case,PE=9×109×10×1010PE=9×1010J