Electrons in a television tube's beam migrate horizontally from South to North. The magnetic field's vertical component points downward. The electron is deflected in the direction of

The electron is deflected in the West direction.

The force experienced by a charged particle travelling in a magnetic field or a current-carrying wire put in a magnetic field is given by Fleming's Left-hand rule.

It is stated that "Stretch the left hand's thumb, forefinger, and middle finger such that they are perpendicular to each other. The forefinger points in the direction of the magnetic field, the middle finger in the direction of charge motion, and the thumb in the direction of force experienced by positively charged particles."

The force's magnitude is determined by

$\Rightarrow F=I(L\times B)$Where I= Amount of current flowing through the conductor, B= Magnetic field, and L= Length of conductor

Given that electrons in a television tube's beam migrate horizontally from South to North, current (I) flows from North to South.

The vertical component of the earth's magnetic field points downward, indicating that it is acting in the east.

As a result, the electrons are diverted to the west.