Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. What is the electric potential (relative to infinity) at the midpoint of the rectangle? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 1.3 MV
B) 2.9 MV
C) 3.5 MV
D) 7.8 MV
B
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A. 29 mJ B. 61 mJ C. 21 mJ D. 66 mJ E. 32 mJ
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Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 ?N, what is the greater of the two currents?
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