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Right-hand Thumb Rule

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Magnetic Field Direction Rules

Electromagnetism explains the relationship between electricity and magnetism. When an electric current flows through a conductor, it produces a magnetic field around it. The Right-Hand Thumb Rule and Maxwell’s Corkscrew Rule help determine the magnetic field direction around a current-carrying conductor.

Right Hand Thumb Rule:

Concept Explanation
Definition A rule to determine the direction of the magnetic field around a straight current-carrying conductor.

Method of Application

 
 
Hold the wire in right hand with thumb pointing in the current direction, and curled fingers show the magnetic field direction.
Magnetic Field Direction - Upward Current → Anticlockwise Magnetic Field
- Downward Current → Clockwise Magnetic Field
Applications - Used to find magnetic field direction in conductors.
- Helps design electromagnets, solenoids, and motors.
- Important in electric generators & transformers.

Maxwell’s Corkscrew Rule:

Concept Explanation
Definition A rule that explains the magnetic field direction using a corkscrew analogy.
Method of Application Imagine turning a corkscrew in the direction of the current. The direction in which it moves forward represents the magnetic field direction.
Magnetic Field Direction - Clockwise Corkscrew Rotation → Downward Current, Clockwise Magnetic Field
- Anticlockwise Corkscrew Rotation → Upward Current, Anticlockwise Magnetic Field
Applications - Used in physics & engineering to study magnetic fields.
- Helps in electromagnetic induction & transformer working.
- Useful in coil and solenoid behaviour analysis.

 

Right Hand Thumb Rule

Maxwell’s Corkscrew Rule

 

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