Magnetic Effects Of EC Flashcards
Define magnetic field
3d space around a magnet in which force of attraction and repulsion can be experienced
So unit of intensity is tesla
Magnetic field lines
Magnetic field is represented by imaginary lines
Properties of magnetic field lines
Directed from N to S pole outside magnet
It is closed and continuous path
They are close near polls and far near middle of magnet
They never intersect
If they are parallel and equidistant they represent a uniform magnetic field
Ampere swimming rule
Imagine a man swimming along the conductor in the direction of current facing a magnetic compass cap near and below the conductor then the north pole of needle will be deflected towards his left hand
Maxwells Right Hand Thumb
Imagine yourself grasping a current carrying conductor with your right hand so that thumb lies along the conductor in the direction of current then the fingers of your hand will be curling in the direction of magnetic field lines
Fleming’s left hand rule
Touch the thumb first and Central finger of your left hand perpendicular to each other if first finger is magnetic field Central finger is current than thumb will be the force on Conductor
Factors affecting magnetic field of a circular current carrying conductor
First Magnetic field is directly proportional to current passing through conductor
Magnetic field is inversionary proportional Two distance from conductor
Magnetic field is Directly proportional to number of turns in the coil
Solenoid
A solenoid is a long cylindrical coil containing a large number of closely space turns of insulated copper wire
Electromagnet
It is a temporary magnet polarity can be reversed and strength Changed
Ac current
