A rod of charge -3.90 nC is bent into a semicircle of radius R= 61.3 cm. A second rod, this one straight of charge +3.90
A rod of charge -3.90 nC is bent into a semicircle of radius R= 61.3 cm. A second rod, this one straight of charge +3.90 nC and length 2R, is placed a distance d= 7.10 cm from the semicircle, as shown below. What is the magnitude of the electric field at the dot? + R + + + + + +
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