Question

how can a uniform magnetic field be obtained?​

Answer 1

When magnetic field lines are parallel then magnetic force experienced by an object is same at all points in that field and such a field is called uniform magnetic field. For example a bar magnet's strength is greater at its poles[non uniform] however inside a solenoid the magnetic field lines are parallel.

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Answer 2

A uniform magnetic field can be obtained by equally spacing  parallel straight lines. The direction of the flux is the direction in which the north-seeking pole of a small magnet points. ... Magnetic fields can  be represented mathematically by quantities called vectors that have direction as well as magnitude.