Draw the pattern of magnetic field lines around a straight conductor carrying electric current. Apply right hand thumb rule to mark the direction of magnetic field.

Right hand thumb rule: If the current carrying conductor is held in the right hand such that the thumb points in the direction of the current, then the direction of the curl of the fingers will give the direction of the magnetic field, as shown in Fig.
Right hand thumb rule: If the current carrying conductor is held in t

Fig. Right hand thumb rule

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