Moving in the x-direction, a particle carrying 1.0uC experiences no force. Moving with speed v at 30 degrees to the x-axis, the particle experiences a force of 2.0 N. What is the magnitude of the force it would experience if it moved along the y-axis with speed v?

Answer 1

http://physics.ucsd.edu/students/courses/summer2009/session1/physics2b/CH29.pdf

Problem 6