Question

A charge q moves in a region of electric field and magnetic field both exist then force is

Answer 1

You must apply the left hand rule to determine the direction of the force exerted.

Left Hand Thumb Rule:

Stretch the thumb,middle and index fingers of the left hand such that they are mutually perpendicular to each other.The index finger represents the direction of the magnetic field whereas the middle finger represents the direction of the electric current.Then the thumb represents the direction of the force exerted by the magnetic field.