When a Potential Difference Is Applied Across a Piece of Wire

When a potential difference is applied across a piece of wire made of metal A,a
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 Ω ∙ m,and the resistivity of metal B is 1.59 × 10^-8 Ω ∙ m.

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

Correct Answer:

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