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There are two charges q1= +15x10-6 C at (-2.0cm, 0.0) and q2= -7x10-6 C at (0.0,...

There are two charges q1= +15x10-6 C at (-2.0cm, 0.0) and q2= -7x10-6 C at (0.0, 3.0cm). They are fixed and cannot move. (a) What is the electric potential V at point P (4.0cm, 0.0) due to these charges? (b) How much would the potential energy U of the system change when a third charge, q3= +6x10-6 C, is moved from infinity to this point P?

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