The force F experienced by a particle of charge e moving with a velocity v in a magnetic field B is given by F= e(vxb). Name the pairs of vectors which are always at right angles to each other.

Dear student,

The force is perpendicular to the direction of the magnetic field.So F is right angle to B.
The force is perpendicular to the velocity of the charged particle.So F is right angle to v
The force is also perpendicular to the plane that contains both B and v.
Regards