A rod in the shape of rectangular solid has cross-sectional area of 17.8 cm^2, l

Question

A rod in the shape of rectangular solid has cross-sectional area of 17.8 cm^2, length of 5.20 cm resistivity of 25.8 Times 10^-8 m. The material from which the block is made has 5.95 Times 10^28 conduction electrons/m^3. A potential differences of 52.6 m V is maintained between its ends. What is the current in the block? 6.98 Times 10^(3) A. 4.65 Times 10^(-1) A 5.81 Times 10^(-1) ma. 6.71 Times 10^(-30 mA. 9.31 times 10^(-2) A. Assume that the current density in the rod is uniform. What is its value? 6.761 Times 10^(-2) A. 4.65 Times 10^(-3)A. 5.81 Times 10^(-1) A.m^2. 6.71 Times 10^(-6) a/M^2. 3.92 Times 10^6a/m^2.

Explanation / Answer

from ohms law V=iR

R =pL/A

0.0526 = I*25.8*10^-8*0.052/(17.8*10^-4)

I =6.98*10^3 A

Correct option is (a)

J = I/A = 6.98*10^3/(17.8*10^-4)

J = 3.92*10^6 A/m^2

correct option is (e)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.