Charge in an Electric Field: A small 0.050-kg insulating sphere carries a charge of -60 ?C and is hanging by a vertical silk thread from a fixed point in the ceiling. An external uniform vertical electric field is now applied. If the applied electric field has a magnitude of 3000 N/C and is directed downward, what is the tension in the silk thread? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0.19 N
B. 0.31 N
C. 0.41 N
D. 0.52 N
E. 0.71 N
Answer: B
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