select the correct answer. in which situation will the lowest resistance occur? a. thick wire and high…

select the correct answer. in which situation will the lowest resistance occur? a. thick wire and high temperature b. thin wire and high temperature c. thick wire and cold temperature d. thin wire and low temperature

select the correct answer. in which situation will the lowest resistance occur? a. thick wire and high temperature b. thin wire and high temperature c. thick wire and cold temperature d. thin wire and low temperature

Answer

Explanation:

Step1: Recall resistance - related factors

Resistance $R$ of a wire is given by $R=\rho\frac{l}{A}$, where $\rho$ is resistivity, $l$ is length and $A$ is cross - sectional area. Larger $A$ (thicker wire) gives lower resistance. Also, resistivity $\rho$ of most materials decreases with decreasing temperature.

Step2: Analyze each option

  • Option A: High temperature increases resistivity and thick wire decreases resistance, but high temperature effect may increase overall resistance.
  • Option B: Thin wire increases resistance and high temperature increases resistivity, so resistance is high.
  • Option C: Thick wire has low resistance due to large cross - sectional area and cold temperature gives low resistivity, resulting in lowest resistance.
  • Option D: Thin wire has high resistance despite low temperature reducing resistivity.

Answer:

C. thick wire and cold temperature