The characteristics of five wires are given in the table.
The gauge is a measure of the diameter of the wire;and #18 corresponds to a diameter of 1.2 × 10 - ³ m;and #22 corresponds to a diameter of 6.4 × 10 - ⁴ m.The resistivity of iron is 9.7 × 10 - ⁸ × m;and the value for copper is 1.72 × 10 - ⁸ × m.
-Which one of the wires carries the smallest current when they are connected to identical batteries?
A)wire E
B)wire D
C)wire C
D)wire B
E)wire A

Question

The characteristics of five wires are given in the table.
 The gauge is a measure of the diameter of the wire;and #18 corresponds to a diameter of 1.2 × 10 - ³ m;and #22 corresponds to a diameter of 6.4 × 10 - ⁴ m.The resistivity of iron is 9.7 × 10 - ⁸ × m;and the value for copper is 1.72 × 10 - ⁸  × m.
-Which one of the wires carries the smallest current when they are connected to identical batteries?
A)wire E 
B)wire D 
C)wire C 
D)wire B 
E)wire A

Quizplus · Accepted Answer

The wire with the highest resistance will carry the smallest current when connected to identical batteries. Assuming all wires are made of the same material and have the same cross-sectional area, the wire with the greatest length will have the highest resistance.

The Characteristics of Five Wires Are Given in the Table