It is noted that when a charge in motion travels through a magnetic field of a magnet. The charge's magnetic field and magnet's magnetic field interact to bend magnet's magnetic field upward or downward . For positive charge bends magnet's magnetic field upward , negative charge bends magnet's magnetic field downward

For positive charge

${\displaystyle F_{B}=+qvB}$

For negative charge

${\displaystyle F_{B}=-qvB}$

Force interacts with electric charge to creates Magnetic Field

${\displaystyle F_{B}=\pm qvB}$

With

${\displaystyle F_{B}}$ . Electrodynamic Force

${\displaystyle q}$ . Electric Charge

${\displaystyle B}$ . Electric Field

${\displaystyle v}$ . speed

From above,

${\displaystyle B={\frac {F_{B}}{\pm qv}}}$