What Should the Magnitude of a Vertical $\vec { E }$

question 90

Multiple Choice

What should the magnitude of a vertical $\vec { E }$ field be so that the force that the electric field exerts on a plastic sphere of mass $2.1 \mathrm {~g}$ that has been charged to -3.0 nC balances the force that Earth exerts on it? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

• A)6.9 × 10⁶ N/C
• B)7.8 × 10⁵ N/C
• C)1.5 × 10⁶ N/C
• D)2.1 × 10⁶ N/C

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