A Physics Student Performed an Experiment in Which the Potential

question 79

Multiple Choice

A physics student performed an experiment in which the potential difference V between the ends of a long straight wire was varied.The current I in the wire was measured at each value of the potential difference with an ammeter and the results of the experiment are shown in the table. Which one of the following statements is the best conclusion based on the data?

• A)The resistance of the wire is 20 .
• B)The wire does not obey Ohm's law.
• C)The current in the wire is directly proportional to the applied potential difference.
• D)The wire obeys Ohm's law over the range of potential differences between 5 and 30 V.
• E)The wire obeys Ohm's law over the range of potential differences between 5 and 20 V.

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Definitions:

Inflation

The rate at which the general level of prices for goods and services is rising, eroding purchasing power.

Positive Economic Statement

A factual claim about the world that can be tested and validated, referring to what is, rather than what ought to be.

Normative

Normative relates to an ideal standard or model, often reflecting opinions about what is desirable or how things should be, especially in ethics and economics.

Gasoline

A petroleum-derived liquid mixture consisting mainly of hydrocarbons, used primarily as fuel in internal combustion engines.