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left hand and right hand rule???

when do you use the left hand rule and when do you use the right hand rule? my teacher said you use the left for when doing a motor but what would you class as a motor?
Reply 1
Avatar for jaffakidds
jaffakidds
generally use right hand for direction of induced emf's (Lenz's Law)
Reply 2
Avatar for selkie222
selkie222
3
I gave up physics since AS and am operating on GCSE level knowledge, so ignore me if I make no sense...

left hand rule is used to find force
right hand rule is used to find current (I)

I'll go away now and back to chemistry (much safer territory for me!)

selkie
Reply 3
Avatar for elpaw
elpaw
15
use the left hand rule with motors, and the right hand rule with dynamos.

motors are machines that change electromagnetic energy into kinetic energy, i.e. currents and voltages into motion; dynamos are machines that change kinetic energy into electromagnetic energy, i.e. motion into voltages and currents.
this is basically what others have said, but here are my revision notes on hand rules:

HAND RULES

first finger field
second finger current
thumb motion

Fleming’s Left Hand Rule
Used when a current from an external source flows through a conductor in a magnetic field, resulting in a force.

e.g. motor
motors drive cars and we drive on the left

Fleming’s Right Hand Rule
Used when an external force produces a motion on a conductor in a magnetic field, inducing a current to flow in the conductor.

e.g. generator/dynamo

Other Right Hand Rule
Point thumb in direction of current; fingers show direction of magnetic field.

You get a “thumbs up” when you are right!

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