In an uniform circular motion, the direction of the net force on the object is radially inward, passing through the center of the circle.
That type of bending is called "diffraction" of waves.
Answer:
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There are some missing information in the question.
However, since you are talking about magnetic force, I think you refer to the Lorentz force. When a particle of charge q and velocity v is immersed in a magnetic field of intensity B, the force acting on the particle is:

where

is the angle between the magnetic field and the direction of the particle.
Therefore, if force F is doubled, then also the velocity v must be double of its initial value: