Three point charges 1C, -2C, and -2C are...

Three point charges 1C, -2C, and -2C are placed at the vertices of an equilateral triangle of side one metre. The work done by an external force to increase the separation of the charges to 2 metres in joules is : (`in_0` permittivity of air)

`(1)/(4 pi epsi_0)`

`(1)/( 8 pi in_0)`

`(1)/( 16 pi in_0)`

`0`

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