At a Distance $d$ From a Point Charge $Q$ , the Energy Density in Its Electric Field Is

question 6

Multiple Choice

At a distance $d$ from a point charge $Q$ , the energy density in its electric field is $u$ . If we double the charge, what is the energy density at the same point?

• A) \(4 u\)
• B) \(u \sqrt { 2 }\)
• C) \(8 u\)
• D) \(2 u\)
• E) \(16 u\)

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Definitions:

Marginal Social Cost

The comprehensive expense encountered by society to produce one more unit of a good or service, encompassing private expenses as well as any extraneous costs.

Efficient Level

The optimal point at which a particular activity achieves the best output or outcome with the least waste of resources or effort.

Marginal Social Cost

The total cost to society of producing an additional unit of a good, including both private costs and any externalities.

External Cost

Costs of a transaction that affect people other than the buyer or seller, often not included in the price of goods or services.