A negative charge moving parallel to a 2 T magnetic fieldexperienced a force of

Question

A negative charge moving parallel to a 2 T magnetic fieldexperienced a force of 5 N.

Which one of the following best explains why the above statement isfalse?

1 N is not a unit offorce.

Negative charges can't have a magneticforce exerted on them because they aren'tmetals.
    
F = qvBsin where is the angle between the velocity and the magneticfield. If the charge is moving parallel to the magnetic field thenthe angle between them is 0o, sin0o is 0, andthe force is 0 N.

W = (Fcos)s where is the angle between the force and the velocity.If the charge is moving parallel to the magnetic field then theangle between the velocity & the force is 90o andcos(90o) is 0. Thus no work is done and as a resultthere must be no force on the charge.

Magnetic fields make charges move incircles so the charge couldn't be moving in a straightline.

The magnetic field mustalways be perpendicular to the velocity. 1

Explanation / Answer

F = qvBsin where is the angle between the velocity and the magneticfield. If the charge is moving parallel to the
   magnetic field then the angle between them is0o, sin0o is 0, and the force is 0N.

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