Fleming's left and right hand rule - how do they work?

[Daniel2244]

Homework Statement

AC production and relationships that determine movement and current flow direction from Flaming's left hand and right hand rule.

Homework Equations

The Attempt at a Solution

Left hand rule for motors- right hand rule for generators
The thumb, index and midle fingers are all right angles to each other.
For left hand rule: I use FBI - thumb = direction of force, index finger = magnetic field and middle finger = direction of current flow.
For right hand rule: I used FBI - thumb= direction of applied force, index finger = direction of magnetic field and middle finger = direction of induced current
AC would use Fleming's right hand rule because a current is induced as well as being produced by a generator.

Just very comfusing as I have come across videos saying that the two fingers are the opposite way around for right hand rule

 

[haruspex]

On a quick search, I have not found any references that swap the fingers in the way you mention. Please post a link to an example or two.

 

[Daniel2244]

On a quick search, I have not found any references that swap the fingers in the way you mention. Please post a link to an example or two.

They're videos: and I can't find the other one.

 

[haruspex]

They're videos: and I can't find the other one.

Ok.
The video provides a right hand rule applicable to a motor. You are used to using a left hand rule for motors, hence the need to swap the fingers. Confusing, but correct.

 

[Daniel2244]

Ok.
The video provides a right hand rule applicable to a motor. You are used to using a left hand rule for motors, hence the need to swap the fingers. Confusing, but correct.

Thanks for clearing it up for me :) I tried looking in comments for reason he did it like but only found poeple with the same question. Also would the right hand rule be applied to the AC production? I would think so just want to double check.

 

[haruspex]

would the right hand rule be applied to the AC production?

The right hand rule in the form you are familiar with applies to a generator, yes.
To get the rule for a motor you either swap hands or swap fingers.

 

[Daniel2244]

The right hand rule in the form you are familiar with applies to a generator, yes.
To get the rule for a motor you either swap hands or swap fingers.

Ok thanks

 

[Daniel2244]

Ok thanks

Not to nag but if current flows away from you and the magnetic field is towards the right the the direction of force is up but when the current/voltage changes polarity and becomes negative would the direction of force be down

 

[haruspex]

Not to nag but if current flows away from you and the magnetic field is towards the right the the direction of force is up but when the current/voltage changes polarity and becomes negative would the direction of force be down

Yes.