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A charge of -2 C is placed at the point (1,0) in some chosen coordinate system....

A charge of -2 C is placed at the point (1,0) in some chosen coordinate system. A charge of -1 C is placed at the point (-1,0). The resulting electric field at the origin (i.e. half way between the charges) is ...

.. pointing right.

  

... pointing left.

  

... zero.

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