A Wire of Resistivity ρ Must Be Replaced in a Circuit

question 7

Multiple Choice

A wire of resistivity ρ must be replaced in a circuit by a wire four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must

• A) remain unchanged.
• B) be two times smaller.
• C) be four times smaller.
• D) be two times larger.
• E) be four times larger.

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