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The electron would experience an electrostatic force towards the north direction, therefore, to nullify its force due to the magnetic field must be acting on the electron towards the south direction. By using Fleming's left-hand rule we can see that the force will be in the north direction if the magnetic field is in the vertically downward direction.
Explanation:
The electron is moving towards the east and has a negative charge therefore
is towards the west direction, Force will be towards south direction if the magnetic field is in the vertically downward direction as 