4. (20pts) A proton enters a uniform magnetic field region with a constant speed 9 = 1.9x107m/s as shown in the figure. The magnitude of the field is B = 17T. According to the coordinate system shown in the figure, (i) Calculate the magnitude and direction of magnetic force acting on %3D the proton in terms of the unit vectors when it enters the field region. (ii) Draw the orbit of the proton on the figure and calculate the orbital radius. (iii) Calculate the angular velocity of the proton. Problem 4 (iv) Calculate the period of motion.

4. (20pts) A proton enters a uniform magnetic field region with a constant speed 9 = 1.9x107m/s as shown in the figure. The magnitude of the field is B = 17T. According to the coordinate system shown in the figure, (i) Calculate the magnitude and direction of magnetic force acting on %3D the proton in terms of the unit vectors when it enters the field region. (ii) Draw the orbit of the proton on the figure and calculate the orbital radius. (iii) Calculate the angular velocity of the proton. Problem 4 (iv) Calculate the period of motion.

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