an electric current is flowing due south along power line .what is the direction of the magnetic field (a) above it  (b)below it

Dear student
We will use right hand thumb rule here.
If you will point your right hand thumb in South direction considering wire in your fist, then your finger curls will direct towards West above the wire and East below the wire.
So, finger curls represent the direction of magnetic field.
Magnetic field will be towards West above the wire and towards East below the wire.

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