Looking for Linear Motor Exercises

AI Thread Summary
The discussion centers on the request for exercises involving linear motors, as the original poster finds none in their physics book. Key concepts mentioned include Lenz's Law and Maxwell's equations, which are relevant to the topic. Participants inquire about the specific physics book being referenced to provide tailored assistance. The conversation highlights the need for practical exercises to better understand linear motors in physics. Overall, the thread seeks to bridge the gap in educational resources for linear motor applications.
paulcaimp
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Homework Statement:: Hi, I'm looking for an exercise involving a linear motor, but on my physics book there are none
Relevant Equations:: Lenz Law, Maxwell's equation

Hi, everyone I'm looking for an exercise involving a linear motor, but on my physics book there are none. Do you happen to have one?

[Moderator's note: moved from a homework forum.]
 
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What physics book are you looking at?
 

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I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
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