# Four equal negative charges, of magnitude 3C are situated at the corners of a square, with a length of side equal to 5. A small test charge ?

of 0.09Coulombs is placed in the exact centre of the square. What is the magnitude of the potential energy of the test charge? Give your answer in GJ

please show step by step workings

### 1 Answer

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- NCSLv 72 months agoFavourite answer
For this configuration and assuming the side length is 5 m,

PE = 4kQq / d

PE = 4*8.99e9N·m²/C²*3C*0.09C / (5m / √2)

PE = 2.7 GJ

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