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/are correct.)

A. The current through the thicker section is smaller than the current through the thinner section.

B. The electric field in the thicker section is smaller than the electric field in the thinner section.

C. The resistivity in the thicker section is smaller than the resistivity in the thinner section.

D. The current density in the thicker section is smaller than the current density in the thinner section.

- It can be a combination of multiple answers, like ABCD or ABC.

- The combination of D + C is INCORRECT.

- The combination of D alone is also INCORRECT.

Can someone please explain why and what the right answer is and why ?

Explanation / Answer

the current remains same

current density J = i/A = E/p

for thicker section J is less..so E is less

p = resistivity depend on charecteristic of materials

A) INCORRECT

B) CORRECT

C) INCORRECT

D) CORRECT

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