Two $10 \phi$ Coins (Dimes) Carrying Identical Charges Are Lying $2.5 \mathrm {~m}$

question 21

Multiple Choice

Two $10 \phi$ coins (dimes) carrying identical charges are lying $2.5 \mathrm {~m}$ apart on a table. If each of these coins experiences an electrostatic force of magnitude $2.0 \mathrm {~N}$ due to the other coin, how large is the charge on each coin? $\left( k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \cdot \mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 } \right)$

• A) \(26 \mu \mathrm { C }\)
• B) \(2.6 \mu \mathrm { C }\)
• C) \(6.7 \mu \mathrm { C }\)
• D) \(5.2 \mu \mathrm { C }\)
• E) \(52 \mu \mathrm { C }\)

---

Definitions:

Cost Recovery Deduction

A tax deduction that allows taxpayers to recover the cost of property or assets over time through depreciation or amortization.

§179 Expense

A section of the U.S. tax code that allows businesses to deduct the full purchase price of qualifying equipment and/or software within a tax year.

Machinery

Mechanical devices or equipment designed to perform a specific task in industrial, commercial, or agricultural applications.

§179 Expense

A tax code allowing businesses to deduct the full purchase price of qualifying equipment or software within the tax year of purchase.