Calc Work Req'd for 4 Charges in Figure

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SUMMARY

The discussion focuses on calculating the work required to move a charge q = -4.8 µC from a distance to the origin in the presence of three other charges: Q1 = 2.8 µC, Q2 = 4.4 µC, and Q3 = -3.7 µC. The work done is determined by the change in potential energy (PE) as described by the equation PE = -W = -F Δx = -qE Δx. The key insight is that the work done on charge q is equivalent to the change in its potential energy when moved from infinity to the origin.

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Homework Statement



Consider the three charges in the figure below with Q1 = 2.8 µC, Q2 = 4.4 µC, and Q3 = -3.7 µC. A fourth charge q = -4.8 µC is brought from very far away and placed at the origin.

http://www.webassign.net/giocp1/18-p-009.gif

How much work is required in this process?
How much work is required to move q from the origin to a distance that is very far away?

Homework Equations



PE = -W = -F Δx = -qE Δx

The Attempt at a Solution



am i suppose to calculate the PE of each Q?
 
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The work done on the charge q is equal to the change of its potential energy when it is moved from infinity to the origin.

ehild
 

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