A wire is made of two sections with different diameters. Which of the following

Question

A wire is made of two sections with different diameters. Which of the following statements is (are) correct? (Please check all that is correct.)   The current through the thicker section is smaller than the current through the thinner section. The electric field in the thicker section is smaller than the electric field in the thinner section.   The resistivity in the thicker section is smaller than the resistivity in the thinner section.     The current density in the thicker section is smaller than the current density in the thinner section. A wire is made of two sections with different diameters. Which of the following statements is (are) correct? (Please check all that is correct.)   The current through the thicker section is smaller than the current through the thinner section. The electric field in the thicker section is smaller than the electric field in the thinner section.   The resistivity in the thicker section is smaller than the resistivity in the thinner section.     The current density in the thicker section is smaller than the current density in the thinner section.   The current through the thicker section is smaller than the current through the thinner section. The electric field in the thicker section is smaller than the electric field in the thinner section.   The resistivity in the thicker section is smaller than the resistivity in the thinner section.     The current density in the thicker section is smaller than the current density in the thinner section.

Explanation / Answer

resistance R = rho L/A

where rho = resistivity and A = area ( pi r^2)

case study 1. now if wire thicker, its radius is more , so AREA is more, Resistance R is less, thus i will be more

case study2. if wire is thinnner, r is less, area is less, R is more, thus i will be less

so by now

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