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Fundamental Constants: Elementary charge e = 1.602 × 10- C Mass of proton mp = 1.673 × 10-27 kg Mass of electron ln,-9.109 × 10-31 kg 1 . Point charges qí 7.00 μC, q,-+2.00 pC and q,--4.00 μC are fixed at locations = (0.250 + 0.433) m, = (0.000 + 0.000) m and尋= (0.500 + 0.000) m. What is the resultant vector force exerted on qi? 2. A proton is suspended in the air by an electric field at the surface of Earth. What is the strength of this electric field? 3. The Figure below shows an arrangement of 3 point charges (a) Calculate the vector electric field at the location of the negative charge due to the two positive charges (b) Calculate the vector Coulomb force on the negative charge. φ +3.50 μ C 0.150 m 0.400 m +2.25 μC -6.25 μ C

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