# Fleming's Left and Right Hand Rules

• abbyD
In summary, the conversation discusses the confusion between FLHR and FRHR in Edexcel A-Level Physics and asks for advice on when to use each rule. It is explained that the Right Hand Rule is for generators and the Left Hand Rule is for motors, with generators producing current through movement and motors producing movement through current. The direction of the current for these rules is from positive to negative.
abbyD
Hi,

I was wondering if anyone has any advice on when to use FLHR and FRHR in the Edexcel A - Level Physics, as I'm mixing them up in questions.

Thanks,

Abby

abbyD said:
Hi,

I was wondering if anyone has any advice on when to use FLHR and FRHR in the Edexcel A - Level Physics, as I'm mixing them up in questions.

Thanks,

Abby
The Right Hand Rule is for a generator, and the Left Hand Rule is for a motor. A generator is where movement causes a current, and a motor is where a current causes movement.

tech99 said:
The Right Hand Rule is for a generator, and the Left Hand Rule is for a motor. A generator is where movement causes a current, and a motor is where a current causes movement.

Thank You!

abbyD said:
Thank You!
Abby, by the way, I just remembered to mention that the direction of the current for these rules is from positive to negative, the "conventional" flow.

## What is Fleming's Left Hand Rule?

Fleming's Left Hand Rule is a mnemonic device used to determine the direction of the force on a current-carrying wire in a magnetic field. It states that if the thumb, index finger, and middle finger of the left hand are extended perpendicular to each other, with the index finger pointing in the direction of the magnetic field, the middle finger in the direction of the current, then the thumb will point in the direction of the force on the wire.

## What is Fleming's Right Hand Rule?

Fleming's Right Hand Rule is a mnemonic device used to determine the direction of the induced current in a wire moving through a magnetic field. It states that if the thumb, index finger, and middle finger of the right hand are extended perpendicular to each other, with the index finger pointing in the direction of the magnetic field, the middle finger in the direction of the motion, then the thumb will point in the direction of the induced current.

## How are Fleming's Left and Right Hand Rules related?

Fleming's Left and Right Hand Rules are related in that they both use the same basic concept of the relationship between magnetic fields, current, and force. However, they differ in their application – Fleming's Left Hand Rule is used for current-carrying wires in a magnetic field, while Fleming's Right Hand Rule is used for a wire moving through a magnetic field.

## What is the practical application of Fleming's Left and Right Hand Rules?

Fleming's Left and Right Hand Rules are commonly used in electrical engineering and physics to determine the direction of forces and currents in magnetic fields. They are also used in designing and analyzing electric motors and generators, as well as in the study of electromagnetic induction.

## Are Fleming's Left and Right Hand Rules always accurate?

In most cases, Fleming's Left and Right Hand Rules provide accurate results, but there are certain situations where they may not apply. For example, they do not take into account the shape or size of the wires or the magnetic field, and they assume ideal conditions. As such, they should be used as a general guide and not as a definitive answer in all cases.

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