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Two charges Q1= -49 μC and   Q2= -26 μC are placed on the two corners of an...

Two charges Q1= -49 μC and   Q2= -26 μC are placed on the two corners of an equilateral triangle as shown in the figure below. If the side length of the triangle is a=90 mm, how much work is required to bring a third charge,  Q3= 34 μC from infinitely far away to the empty corner of the triangle?

Please take k = 9.0 x 109 N.m2/C2 and express your answer using one decimal place in units of J or N.m. Please do not forget to type the minus sign if you got a negative value.

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