1. Two point charges, -3.2 x 10-9 C and 9.9 x 10-9 C, are separated by 0.7 m. Wh
ID: 2104710 • Letter: 1
Question
1. Two point charges, -3.2 x 10-9 C and 9.9 x 10-9 C, are separated by 0.7 m. What is the magnitude of the electric field midway between them? 2. Charge 2.2 x 10-9 C is placed on a conducting spherical shell that has an inner radius of 4.9 cm and an outer radius of 7.3 cm. A point charge -2.8 x 10-9 C is placed inside the shell, at the center. What is the magnitude of the electric field of this configuration, at a distance 8.8 m from the center of the shell? 3.Charge is distributed uniformly on the surface of a very large flate plate. The electric field at a point 0.7 cm from the plate, on a line that is perpendicular to the plate, is 28.9 N/C. What is the electric field 8.1 cm from the plate, along this same line?Explanation / Answer
a)E= 4*k(q1+q2)/d^2 = 962.44 N/C b) E =k(q1-q2)/r^2 = 0.069 N/C c) E = sigma /e0 so E does not depend on dist E = 28.9 N/C
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