Magnetic field and charged particle help

[MrDMD83]

When a charged particle moves at an angle of 13° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 2.4F?

 

[OlderDan]

Please post your attempt at solving this problem.

 

[MrDMD83]

It says to use Ampere's law

Sum of(Bparallel x change in length) = Permeability of free space x Amperage. This is due by noon today. Please help.

 

[MrDMD83]

It says to use Ampere's law

Sum of(Bparallel x change in length) = Permeability of free space x Amperage. This is due by noon today. Please help.

 

[OlderDan]

Sum of(Bparallel x change in length) = Permeability of free space x Amperage. This is due by noon today. Please help.

You have a charged particle moving in a magnetic field. The force depends on the strength of the field, the velocity of the charge, the magnitude and sign of the charge, and the angle between the velocity direction and the field direction. In this problem all you are changing is the angle between the directions. Do you know the equation that espresses this relationship?