# My mind is blown. ΔV problem from MIT lecture.

by mrspeedybob
Tags: Δv, blown, lecture, mind
 P: 696 The lecture in question... http://www.youtube.com/watch?v=eqjl-qRy71w So what happens if I actually build this circuit and hook my fluke to it? How can moving my meter from the right side of the table to the left change my voltage reading if the circuit and my meter's connection to it is untouched? What happens if I put the meter directly on top of the solonoid? Can someone try to explain this in a way that is different than the professor did?
Thanks
PF Gold
P: 12,123
 Quote by mrspeedybob The lecture in question... http://www.youtube.com/watch?v=eqjl-qRy71w So what happens if I actually build this circuit and hook my fluke to it? How can moving my meter from the right side of the table to the left change my voltage reading if the circuit and my meter's connection to it is untouched? What happens if I put the meter directly on top of the solonoid? Can someone try to explain this in a way that is different than the professor did?
Good question.
I think the answer, in practical terms, must be to do with the way your meter leads would routed (there have to be connecting leads, of course). They will also experience an induced emf as the magnet moves in and out. If they are on the left of the loop, the emf will be in the opposite direction to the emf induced when they're on the right side - this will add or subtract the emf from the emf across the various components and give you different answers.

 P: 409 My mind is blown. ΔV problem from MIT lecture. Read this PDF file http://www.physicsforums.com/showpos...&postcount=257