How Does the Speed of a Van Affect the Lorentz Force in a Magnetic Field?

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Homework Help Overview

The discussion revolves around understanding the relationship between the speed of a van and the Lorentz force in a magnetic field, specifically in the context of an induction problem involving varying magnetic fields.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to understand how to approach the problem, expressing uncertainty about the role of the van's speed. Some participants suggest using the equation E = Bul and discuss the relationship between induced current and changing magnetic fields.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem. Some guidance has been offered regarding relevant equations, but there is a noted lack of sufficient information to fully resolve the question.

Contextual Notes

Participants question the adequacy of the information provided in the problem statement, particularly regarding the need for details on how the magnetic field varies over time to calculate the induced voltage.

elecstudent1
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Homework Statement



Problem is http://imgur.com/bQIFJ

Homework Equations



I presume F=BIl and E=Blu.

The Attempt at a Solution



Not very well. I don't really understand how to start the question so if I could get some nudges in the right direction that'd be great. I'm not sure how the speed of the van comes into play here. I gather that I'll have to work out V once for the 38uT field density and then again for the 42uT and get the difference.
 
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You can find it using E= Bul
 


I don't think the question has enough information. A loop of wire will not produce any output voltage unless the field is varying. To calculate the output you need the rate at which the field is varying. Vehicle speed plus the two field strengths is not enough to establish the rate of change of the field.

The equation you need is V = - N d(phi)/dt

Do you have a picture/drawing of what this "detector" looks like?
 

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