A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a ?3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners?
A. 20 N/C
B. 14 N/C
C. 4.0 N/C
D. 12 N/C
E. 8.0 N/C
Answer: B
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