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Compute (a) the electric field E in air at a distance of 30 cm from a point charge q1 = 5.0 x 10^(—9) C, (b) the force on a charge q2 = 4.0 x 10^(—10) C placed 30 cm from q1, and (c) the force on a charge q3 = —4.0 x 10^(—10) C placed 30 cm from q1 (in the absence of q2). |
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