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Question

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?


A

9×109J

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B

9×1010J

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C

9×1011J

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D

None of these

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Solution

The correct option is B

9×1010J


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


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