When a Potential Difference Is Applied Across a Piece of Wire

question 66

Multiple Choice

When a potential difference is applied across a piece of wire made of metal A, a $5.0 - \mathrm { mA }$ current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10^-8 ? ? m, and the resistivity of metal B is 1.59 × 10^-8 ? ? m.

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

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