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Name _______________________________________ Date_____________________ Per. _________ HW Physics Magnetic force and Particle Motion 1. A positive charge of 0.25C moves horizontally to the right at a speed of 2.0x102 m/s and enters a magnetic field directed vertically downward. If it experiences a force of 20N, what is the magnetic field strength? 2. An electron (1.6 × 10-19 C) moves south at a velocity of 1.2 x 105 m/s and has a magnetic force of 2.2 x 10-10 N exerted on it. If the magnetic field points downward, what is the magnitude of the magnetic field? 3. A charge of 0.050C moves vertically in a field of 0.080T that is oriented horizontally. What speed must the charge have to experience a force of 10N? 4. A singly charged positive ion (3.2 × 10-19 C) has a mass of 6.68 × 10–27 kg. After being accelerated through a potential difference, it has a velocity of 5.66 × 104 m/s. The ion then enters a magnetic field of 0.500 T, in a direction perpendicular to the field. Calculate the magnitude of the magnetic force on the ion. 5. A beam of protons (mp = 1.672 × 10-27 kg) is accelerated to a speed of 5.0x106 m/s in a particle accelerator and emerges horizontally from the accelerator into a uniform magnetic field. What B field would cancel out the force of gravity and keep the beam of protons moving in a straight line? (Hint: Gravitational force must equal Magnetic force) 6. A proton (1.60 × 10-19 C), with a mass of 1.672 × 10-27 kg, travels with a speed of 3.0 × 106 m/s perpendicular with the direction of a magnetic field of 0.30 T. What are: (a) the magnitude of the magnetic force on the proton (b) the proton’s acceleration? 7. A proton (1.60 × 10-19 C), with a mass of 1.672 × 10-27 kg, travels with a speed of 1.90 × 104 m/s at an angle of 37° with the direction of a magnetic field of 0.85 T. What are: (a) the magnitude of the magnetic force on the proton (b) the proton’s acceleration?