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Physics - Magnetic Effects of Electric CurrentPhysics - Magnetic Effects of Electric Current

IntroductionIntroduction

The electricity and magnetism are linked to each other and it is proved when the electricThe electricity and magnetism are linked to each other and it is proved when the electriccurrent passes through the copper wire, it produces a magnetic effect.current passes through the copper wire, it produces a magnetic effect.

The electromagnetic effects first time noticed by Hans Christian Oersted.The electromagnetic effects first time noticed by Hans Christian Oersted.

Magnetic FieldMagnetic Field

Magnetic field is a quantity, which has both magnitude and direction.Magnetic field is a quantity, which has both magnitude and direction.

The direction of a magnetic field is usually taken to be the direction in which, a north poleThe direction of a magnetic field is usually taken to be the direction in which, a north poleof the compass needle moves inside it.of the compass needle moves inside it.

It is the convention that the field lines emerge from north pole and merge at the south poleIt is the convention that the field lines emerge from north pole and merge at the south pole

..

No two field-lines of a magnet bar are found to cross each other. If it happens, then itNo two field-lines of a magnet bar are found to cross each other. If it happens, then itmeans that at the point of intersection, the compass needle would point towards twomeans that at the point of intersection, the compass needle would point towards twodirections, which is simply not possible.directions, which is simply not possible.

The magnitude of the magnetic field The magnitude of the magnetic field at a given point at a given point

increases with the increase of current through the wire.increases with the increase of current through the wire.

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Right-Hand Thumb RuleRight-Hand Thumb Rule

Also known as Maxwell’s corkscrew rule, right-hand thumb rule illustrates direction of theAlso known as Maxwell’s corkscrew rule, right-hand thumb rule illustrates direction of the

magnetic field associated with a current-carrying conductor magnetic field associated with a current-carrying conductor ..

Right-hand thumb ruleRight-hand thumb rule states that states that “Imagine that you are holding a current-carrying“Imagine that you are holding a current-carryingstraight conductor in your right hand such that the thumb points towards the direction ofstraight conductor in your right hand such that the thumb points towards the direction ofcurrent. Then your fingers will wrap around the conductor in the direction of the field linescurrent. Then your fingers will wrap around the conductor in the direction of the field linesof the magnetic field.”of the magnetic field.”

Fleming’s Left-Hand RuleFleming’s Left-Hand Rule

Fleming’s left-hand ruleFleming’s left-hand rule states that states that “Stretch the thumb, forefinger and middle finger of“Stretch the thumb, forefinger and middle finger ofyour left hand such that they are mutually perpendicularyour left hand such that they are mutually perpendicular

. If the first finger points in the direction of magnetic. If the first finger points in the direction of magnetic

field and the second finger in the direction of current, then the thumb will point in thefield and the second finger in the direction of current, then the thumb will point in thedirection of motion or the force acting on the conductor.”direction of motion or the force acting on the conductor.”

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Human body also produces magnetic field; however, it is very weak and about one-billionthHuman body also produces magnetic field; however, it is very weak and about one-billionthof the earth’s magnetic field.of the earth’s magnetic field.

Heart and brain are the two main organs in the human body where the magnetic field hasHeart and brain are the two main organs in the human body where the magnetic field hasbeen produced.been produced.

The magnetic field inside the human body forms the basis of getting the images of differentThe magnetic field inside the human body forms the basis of getting the images of differentparts of the body.parts of the body.

The technique used to get the image of body part is known as the The technique used to get the image of body part is known as the Magnetic ResonanceMagnetic Resonance

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