answer all three qeustions please

A proton enters a uniform magnetic field at a 90-degree angle. Considering the proton's motion in the magnetic field, the magnetic force serves as the A. tension B. gravitational force C. centripetal force D. frictional force QUESTION 9 In the previous question, the proton's speed is 5.85103m/s, and the uniform magnetic field has a strength of 0.038 T, the radius of the proton's path is m. Exponent format with 3SF. QUESTION 10 An induced emf will occur if A. the strength of the magnetic field is changed. B. the coil's area is changed. C. the angle at which the magnetic field and the coil's area meet is changed. D. all of the above