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Three point charges q1=1 μC , q2=2 μC and q3=-3 μC are located at three corners...

Three point charges q1=1 μC , q2=2 μC and q3=-3 μC are located at three corners of a square of side a=2 cm . Charge q3 is located diagonally opposed to the empty corner of the square.

  1. Calculate the electric potential created by the three charges at the empty corner of the square.
  2. Calculate the work done by the electric field of the three charges when a fourth charge q4=-4 μC moves from the center of the square to the empty corner of the square.

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