The figure below shows four situations in which positive and negative charges mo

Question

The figure below shows four situations in which positive and negative charges move horizontally and gives the rate at which each charge moves. Rank the situations according to the effective current through the regions, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.) The following table gives the lengths of three copper rods, their diameters, and the potential differences between their ends. (a) Rank the rods according to the magnitude of the electric field within them, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.) (b) Rank the rods according to the current density within them, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.) (c) Rank the rods according to the drift speed of electrons through them, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.) Three wires, of the same diameter, are connected in turn between two points maintained at a constant potential difference. Their resistivities and lengths are rho and L (wire A), 1.2 rho and 1.2L (wire B), and 0.9 rho and L (wire C). Rank the wires according to the rate at which energy is transferred to thermal energy within them, greatest first. (Use only ">" or "=" symbols. Do not include any parentheses around the letters or symbols.)

Explanation / Answer

Problem2:

For Rod1,V=V,l=L,d=3d

For Rod2,V=2V,l=2L,d=d

For Rod3,V=2V,l=3L,d=2d

Electric field intensity:

We know E=VL

Rod1,E=VL

Rod2,E=2V.2L=4VL

Rod3,E=2V.3L=6VL

Rod3 >Rod2 >Rod1

Current Density:

J=E

Rod1, J=E= VL

Rod2, J=E= 4VL

Rod3, J=E= 6VL

Rod3 >Rod2 >Rod1

Drift Speed of electrons:

U=µE

Rod1, U=µE= µVL

Rod2, U=µE=4 µVL

Rod3, U=µE=6 µVL

Rod3 >Rod2 >Rod1

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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