Two Small Insulating Spheres Are Attached to Silk Threads and Aligned

question 13

Multiple Choice

Two small insulating spheres are attached to silk threads and aligned vertically as shown in the figure.These spheres have equal masses of 40 g,and carry charges q₁ and q₂ of equal magnitude 2.0 μC but opposite sign. The spheres are brought into the positions shown in the figure,with a vertical separation of 15 cm between them.Note that you cannot neglect gravity.(k = 1/4πε₀ = 8.99 × 10⁹ N • m²/C²) The tension in the lower thread is closest to

• A) 1.2 N.
• B) 1.4 N.
• C) 1.6 N.
• D) 1.8 N.
• E) 2.0 N.

---

Definitions:

Trade

The act of buying, selling, or exchanging goods and services between people, states, or countries.

Adam Smith

An 18th-century Scottish economist and philosopher, best known for his works "The Wealth of Nations," which laid the foundations of classical free-market economic theory.

European Colonization

The process by which European powers occupied and controlled lands outside their continent, starting in the late 15th century, often resulting in significant cultural and economic changes.

"Discovery"

Often refers to the European "discovery" of lands outside of Europe, although these lands were already inhabited, marking the beginning of colonization.