A Small $0.050 - \mathrm { kg }$ Insulating Sphere Carries a Charge Of

question 95

Multiple Choice

A small $0.050 - \mathrm { kg }$ insulating sphere carries a charge of $- 60 \mu \mathrm { C }$ 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 $3000 \mathrm {~N} / \mathrm { C }$ and is directed downward, what is the tension in the silk thread? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

• A) \(0.19 \mathrm {~N}\)
• B) \(0.31 \mathrm {~N}\)
• C) \(0.71 \mathrm {~N}\)
• D) \(0.41 \mathrm {~N}\)
• E) \(0.52 \mathrm {~N}\)

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