Know the direction?
An electron is traveling through a region of space with a magnetic field in the direction as shown. If the magnetic force due to the field is in the direction as shown, the velocity of particle must be in which direction?
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The correct answer is -x.The force is given by F = q × B ∗ V .By applying the left hand rule because the particle is electron meaning negative charge.For positive charged particle the velocity would be in + x direction but since this electron the direction is − x .