Tuesday, September 20, 2016

Fleming's Both Hands Rule!

Good afternoon everyone, so I think today is a good day to write about something kind of confusing which is Fleming's Left hand rule and his right hand rule. These rules are just mnemonic or you can call them memory technique to remember the directions of current, magnetic field and motion in both motor and generator.

So first things first remember this;

1. Fleming's Left-hand rule is used for electric motors.
2. Fleming's right-hand rule is used for electric generators.

Now let's talk about how to apply these rules, starting with left-hand or the motor hand.

As we are talking about motor the current and the magnetic field will be given but the force direction will be unknown. If a current carrying wire is subjected to a magnetic field in a perpendicular fashion then the wire will feel a force which is perpendicular to both the direction of current and magnetic field. So we are talking about 3 axis here, if you set say the field and current to x and y axis respectively then the motion will be in z axis. Things are a bit complicated without any visual representation.

Here is a left hand diagram where

Thumb or F is the force vector or the thrust on the conductor or motion of it. 
Fore finger or B represents the direction of magnetic field or flux density.
Second finger or I represents the direction of current.

Let's move on to the right hand rule now.

For generators however the motion and the field is given we need to know the direction of current. So thing is if we subject a moving conductor in a magnetic field we will get current which is both perpendicular to the two applied causes. Again let's look at a visual representation.

In here

The thumb is the motion of the conductors.
Fore finger is the magnetic field.
Second finger is the direction of current.

So that's a brief description of Fleming's left and right hand rules.

For more info visit the wiki links.

Left hand.
Right hand.

You can also read my other posts here.

Index to my blog.

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