Could someone please help me with these physics questions?

You have a summer internship in a medical research laboratory. They are investigating the possible use of short-lived isotopes to fight cancer. The diagram below illustrates what happens in their experiment. He nuclei (which we refer to as a particles) which are initially at rest are accelerated by using a potential difference of 5000 V. You may use ma = 6.64 x 10-27 kg and qa = 3.2 x 10-19 C. The a particles initially travel straight to the right in a tube, then they follow a circular arc for exactly one-fourth of a circle and lastly they travel straight "down" to reach a collision region. In that region, they will collide with some other nuclei to form the isotopes needed in the medical study. Accelerator Collision Region1. There are four points marked along the path the a particles follow. On the above diagram, indicate the direction of the force on the a particle at each instant. If there isn't a force, please indicate that. Explain your reasoning.2. Determine the speed the a particles have as they leave the accelerator. Hint: this is basically a review question which you could have been asked just after we had finished the chapter covering electric potential and electric potential energy. 3. The dashed region of the previous diagram highlights the only section where the a particles change direction. To force them to do this, there is a constant magnetic field present in that region. In what direction does that field point? Explain your reasoning. 4. The magnetic field in that region has a strength of 0.03 T. If the a particles are to stay perfectly in the center of the tube, what must be the radius of the circular arc they travel in (R in the diagram)