Potential Energy of Point-Charges: a Tiny Object Carrying a Charge

question 50

Multiple Choice

Potential energy of point-charges: A tiny object carrying a charge of + 3.00 μC and a second tiny charged object are initially very far apart. If it takes of work to bring them to a final configuration in which the object i is at x = 1.00 mm, y = 1.00 mm, and the other charged object is at x = 1.00 mm, y = 3.00 mm, find the magnitude of the charge on the second object. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

• A) 2.15 μC
• B) 4.30 μC
• C) 10.74 μC
• D) 4.30 nC

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Definitions:

Equity Method

An accounting technique used to record investments in other companies, where the investment is initially recorded at cost and adjusted thereafter for the investor's share of the investee's net income or loss.

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Equipment

Tangible personal property used in operations, such as machinery or office hardware, that is not intended for sale.

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The difference between the cost of an acquisition and the fair value of net assets acquired, often recognized as goodwill on the balance sheet.