A Small 0050-Kg Insulating Sphere Carries a Charge of -60 μC and μC

Multiple Choice

A small 0.050-kg insulating sphere carries a charge of -60 μC 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 = 1/4πε₀ = 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