A train, moving at speed v, is too far away to be seen. Assume the rails are a d

Question

A train, moving at speed v, is too far away to be seen. Assume the rails are a distance d apart and are electrically insulated from each other. (Figure P8). The resistance per meter of the rail is r. The perpendicular magnetic flux density of the earth is B and points down. Being a student of electromagnetics, you have voltmeters, to measure the voltage V, and current meters to measure the current I and magnetometers to measure the flux B. The potential of rail U is higher than that of rail D. The train is: Moving to the left Moving to the right The train does not have to move Not enough information to tell

Explanation / Answer

it's the first option " moving to the left " since emf = - dφ/dt , so if the train is moving to the left, then dA/dt is negative , hence dφ/dt < 0 , so emf (Vud) is positive which means Vu > Vd 

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

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