Kaplan #24 Resistivity

[EEpowerOK]

As I understand, resistivity increases and temperature decreases.

In #24 they calculate Resistance at 20 C being 13.75 ohm, and at 50 C being 15.4 ohm.

Seems their answer does not follow the rule.

 

[iahim]

I don't have Kaplan so I'm not sure what the problem is asking.

For a conductor, resistance/resistivity increases with the increase in temperature.

The insulation is opposite: when the temperature increases, the insulation resistance decreases.