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# flemings hand rule thingys watch

1. could someone clear this up for me when do i use the left hand and when the right hand?
also the specification says you should be able to "use lenzs law to determin the direction of an induced emf" to do this would i use the hand thingy?

thanks alot
2. left hand for magnetic fields, i think right hand is for electric fields
3. i always thought it was right hand when u put MOTION IN
and left hand when u put CURRENT in

? i could be wrong... thats how ive always remember it though
4. Left hand rule is to find the DIRECTION of the force on a charge moving in a field.
right hand rule is to find the mangetic field generated by the movement of charge (usually in a wire).

So left hand one is to find the EFFECT of the B-field on a moving charge (b-field leads to force on current)
right hand rule is to find the EFFECT of the moving charge on the B-field (force on current leads to B-field)

practice this... work out using both hands whether two parallel conductors with current travelling in the same direction in each will be attracted or repelled. and then work it out for when the current goes in opposing directions.
5. Right hand is used to find out wat the field is around a moving charge (normally a current carrying wire)...ure thumb is the current and our fingers show the radial field around the wire and its direction
6. riGht hand is Generators (motion)

Left hand is the other one.

That's what my physics teacher told me, anyway, and he seemed to be pleased with the whole G thing. *shakes head* easily pleased...
7. "Left hand rule is motor rule, because in England we motor on the left" as my physics teacher would say
8. Just been looking this up, as there seem to be different answers coming up.

I was wrong before, the left hand rule is for motion (thumb=movement, index=field, middle=current), and the right hand rule is for electromagnetic induction. That's according to my textbook anyway.

*curses teacher*

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