When a voltage difference is applied to a piece of metal wire, a ...

[corkyiscool3328]

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   m, and the resistivity of silver is 1.59  10-8   m.) A) 21 mA
  B) 19 mA
  C) 11 mA
  D) 5.3 mA

Question 2

How much current will be flowing through a 40.0 m length of cylindrical metal wire with radius 0.0 mm if it is connected to a source supplying 16.0 V? The resistivity of this metal is 1.68  10-8   m.
 
  A) 1200 A
  B) 9.5  108 A
  C) 68 nA
  D) 710 A

[elizabethrperez]

Answer to Question 1

A

Answer to Question 2

A

[corkyiscool3328]

Thanks for the timely response, appreciate it

[Liddy]

Gracias!