How the modulus of the maximum force Fmax is determined acting from the side of a uniform magnetic field with induction

How the modulus of the maximum force Fmax is determined acting from the side of a uniform magnetic field with induction B on a section of a straight conductor of length l, if the current in it is equal to I

The modulus of the force with which a uniform magnetic field acts on a straight conductor with current placed in it is equal to the product of the modulus of the magnetic induction vector of this field, the current strength, and the length of the conductor segment.

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