state and explain properly maxwell right hand thumb rule

Maxwells right hand thumb rule indicates the direction of magnetic field for a known direction of current. If the thumb of the right hand points along the direction of current then the curled fingers of that hand gives the direction of the magnetic field due to the current.

When thumb is upwards the curled fingers are anti-clockwise. So, magnetic field is anti-clockwise.

When thumb is downwards the curled fingers are clockwise. So, magnetic field is clockwise.

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