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# Flemings left hand rule watch

1. I do not understand this and I have watched videos but unfortunately have made no progress. Could someone please attempt to explain this to me? I would very much appreciate it. Thanks in advance!
2. This isn't going to be helpful in terms of the topic but I vaguely remember doing this in physics and not understanding it, (I don't think anyone else really did either) but I still got an A in the exam which it was in so I wouldn't worry too much, if there's like one question you can't answer it isn't the end of the world.

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3. This rule applies to the Motor Effect (when a wire with a current flowing through it is placed between two magnets). The wire will move due to a resultant force that acts on it, which is caused by the intersection of the two magnetic fields (the field acting perpendicular to the wire between the two magnets and the field around the wire caused by the current flowing through it).

An example of this is shown in the diagram above; to find out the direction of the force acting on the wire (ie whether the wire moves up or down), we use Flemings LHR. Using your left hand, if you stick your thumb, first and second finger out in all three planes (so that they are all 90 degrees apart from each other), the thumb represents the direction of the force on the wire, the first finger represents the direction of the magnetic field (North to South) acting perpendicular to the wire and the second finger represents the direction of the current (not electron flow)! This therefore explains why the wire in this diagram moves upwards as a result.

Try doing some other examples and depending on your level, add in some maths to help with your calculations; this rule will become second nature after a few questions!
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4. (Original post by MathsAstronomy12)
This rule applies to the Motor Effect (when a wire with a current flowing through it is placed between two magnets). The wire will move due to a resultant force that acts on it, which is caused by the intersection of the two magnetic fields (the field acting perpendicular to the wire between the two magnets and the field around the wire caused by the current flowing through it).

An example of this is shown in the diagram above; to find out the direction of the force acting on the wire (ie whether the wire moves up or down), we use Flemings LHR. Using your left hand, if you stick your thumb, first and second finger out in all three planes (so that they are all 90 degrees apart from each other), the thumb represents the direction of the force on the wire, the first finger represents the direction of the magnetic field (North to South) acting perpendicular to the wire and the second finger represents the direction of the current (not electron flow)! This therefore explains why the wire in this diagram moves upwards as a result.

Try doing some other examples and depending on your level, add in some maths to help with your calculations; this rule will become second nature after a few questions!
Thanks very much for your reply. I understand it a bit better now. I will try to get my teacher to re-explain it to me and hopefully this will be sorted.
5. I was struggling with this as well but I watched this video:
https://www.youtube.com/watch?v=8li1Vp8vLaI then did a few practise questions and now I'm fine

(it's a really dumb video which is mostly unnecessary, but whatever, it helped )

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Updated: February 3, 2016
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