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Figure shows three charges held in
fixed positions by forces that are not shown.
(a)-Find the net electric force on charge q. due to the other
two charges. (b) What is the electric potential energy of this
system of charges? Assume that d=12 cm and q, = +q, q; = -
| 4q, q; = +2q, in which q= 150 nC .
+
d
93

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