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:

External Variables

Factors outside the control of an experiment or study that can influence its outcome.

Socioeconomic Factors

Aspects related to a person's economic and social position that affect their health and access to resources.

Emotional Factors

Elements that influence feelings, mood, and emotional state, impacting behavior and mental health.

Risk Factors

Variables or conditions that increase the likelihood of developing a disease or injury.