A metal sphere of radius 10 cm carries an excess charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm above the sphere's surface? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 4.0 × 105 N/C
B) 8.0 × 107 N/C
C) 4.0 × 107 N/C
D) 8.0 × 105 N/C
E) 4.0 × 109 N/C
D
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