A Wire of Resistivity ρ Must Be Replaced in a Circuit

question 74

Multiple Choice

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

• A)be the same as the original diameter.
• B)be one-half the original diameter.
• C)be one-fourth the original diameter.
• D)be two times the original diameter.
• E)be four times the original diameter.

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