When a Voltage Difference Is Applied to a Piece of Metal

question 27

Multiple Choice

When a voltage difference is applied to a piece of metal wire, a 5.0-mA current flows through it. If this metal wire is now replaced with a silver wire having twice the diameter of the original wire, how much current will flow through the silver wire? The lengths of both wires are the same, and the voltage difference remains unchanged. (The resistivity of the original metal is 1.68 × 10^-8 Ω ∙ m, and the resistivity of silver is 1.59 × 10^-8 Ω ∙ m.)

• A) 21 mA
• B) 19 mA
• C) 11 mA
• D) 5.3 mA

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Definitions:

Oral Retentive

A psychoanalytic concept referring to an individual who exhibits traits such as obsessiveness or tidiness, theorized to stem from unresolved issues during the oral stage of psychosexual development.

Reaction Formation

A defense mechanism where an individual unconsciously replaces unacceptable impulses with their opposites, often resulting in exaggerated behavior.

Unconscious Awareness

The state of having processes in the mind that occur without conscious perception, influencing thoughts, feelings, or actions.

Id

A component of personality in psychoanalytic theory, it represents the instinctual drives and is the source of basic impulses and desires.