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Physics Flashcards: Apply Coulombs Law

Study Apply Coulombs Law in Physics with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

Find q2q_2 if F=0.90 NF=0.90\ \text{N}, q1=+1×10−6 Cq_1=+1\times 10^{-6}\ \text{C}, and r=0.10 mr=0.10\ \text{m}.

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ANSWER

∣q2∣≈1.0×10−6 C|q_2|\approx 1.0\times 10^{-6}\ \text{C}. ∣q2∣=Fr2k∣q1∣=0.90×0.018.99×109×10−6≈1.0×10−6 C|q_2| = \frac{Fr^2}{k|q_1|} = \frac{0.90 \times 0.01}{8.99\times10^9 \times 10^{-6}} \approx 1.0\times10^{-6}\ \text{C}

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Practice questions

1 of 50Practice questions for this set
Two small conducting spheres can be treated as point charges. Sphere A has charge q1=+3.0 μCq_1 = +3.0\,\mu\text{C} and sphere B has charge q2=+6.0 μCq_2 = +6.0\,\mu\text{C}. Their centers are separated by r=0.30 mr = 0.30\,\text{m}. Using Coulomb's Law with k=9.0×109 N⋅m2/C2k = 9.0\times10^9\,\text{N}\cdot\text{m}^2/\text{C}^2, what is the magnitude of the electric force between the spheres (in N)?
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