MAGNETIC EFFECT OF CURRENT

Magnetic effect of currentIf current flows through a conductor setup magnetic field around it is first observed by Oersted in 1820 . After that Biot-savart  established a formula for magnetic field due to small current carrying conductor. Direction of magnetic field can be found using right hand thumb rule . If current is flowing through st. line  and thumb shows the direction of current flowing through it then curled finger gives the direction of magnetic field. If current flowing through a circular coil ,and curled finger shows the direction of current then thumbs gives the direction of magnetic field.

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