Spheres of Charge: In the figure, a conducting sphere of radius r1 = 0.050 m is placed at the center of a spherical conducting shell of inner radius r2 = 0.100 m and outer radius r3 = 0.140 m. The inner sphere carries an excess charge of -4.0 nC. The outer spherical shell carries a net excess charge of 3.0 nC. Calculate the magnitude of the electric field at the following distances r from the center of the spheres. (k = 1/4??0 = 9.0 × 109 N ? m2/C2) (a) r = 0.075 m (in the air space between spheres),(b) r = 0.120 m (in the metal of the spherical shell), and(c) r = 0.200 m (outside the spherical shell).
What will be an ideal response?
(a) 6.4 × 103 N/C (b) 0 N/C (c) 2.2 × 102 N/C
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