Question

Which statement correctly describes the resistivity of a wire?(1 point)

A.) Resistivity depends on the current through the wire and has units of ohms.
B.) Resistivity depends on the material the wire is made from and has units of ohm-meters.
C.) Resistivity depends on the material the wire is made from and has units of ohms.
D.) Resistivity depends on the current through the wire and has units of ohm-meters.

Which representation shows the relationship between resistance and the length of a wire?(1 point)

A.) R∝LR∝L

B.) R∝1LR∝1L

C.) R∝L2R∝L2

D.) R∝1L2



The table shows the resistivity of four different materials.

Material
Resistivity (Ω⋅m)

Aluminum 2.65 x 10–8
Copper 1.68 x 10–8
Silver 1.59 x 10–8
Tungsten 5.60 x 10–8
About how many times greater is the resistance of a tungsten wire than the resistance of a silver wire of the same length and cross-sectional area? (1 point)

A.) 0.28

B.) 3.52

C.) 2.11

D.) 3.33


The resistance of a wire is 8 Ω. What would the resistance be if the length of the wire was increased by a factor of four?(1 point)

A.) 32 Ω

B.) 16 Ω

C.) 2 Ω

D.) 4 Ω


What current is produced with a voltage of 6.0 V and a resistance of 445 ohms?(1 point)

A.) 17.4 mA

B.) 11.0 mA

C.) 15.7 mA

D.) 13.5 mA


Suppose wire X and wire Y are made of different materials, and have different lengths and cross-sectional areas. What is the ratio of the resistance of wire X to the resistance of wire Y?

The length of wire X is one fifth the length of wire Y.
The radius of wire X is one third the radius of wire Y.
The resistivity of the material of wire X is half the resistivity of the material of wire Y.
(1 point)

A.) 9:10

B.) 10:9

C.) 10:3

D.) 3:10

Answer 1

1-Resistivity depends on the material the wire is made from and has units of ohm-meters.
2-R∝L
3-3.52
4-32 Ω
5-13.5 mA
6-9:10