# Practice Problems - Practice Problems Test#2 with Solutions...

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Practice Problems Test #2 with Solutions *10. One component of a magnetic field has a magnitude of 0.048 T and points along the xaxis, while the other component has a magnitude of 0.065 T and points along the yaxis. A particle carrying a charge of 2.0 105C is moving along the zaxis at a speed of 4.2 103m/s. (a)Find the magnitude of the net magnetic force that acts on the particle. (b)Determine the angle that the net force makes with respect to the xaxis. Solved in class: Answers: a) 6.8x10-3N; b) 36° Section 21.3The Motion of a Charged Particle in a Magnetic Field Section 21.4The Mass Spectrometer 12.An ionized helium atom has a mass of 6.6 1027kg and a speed of 4.4 105m/s. It moves perpendicular to a 0.75-T magnetic field on a circular path that has a 0.012-m radius. Determine whether the charge of the ionized atom is eor 2e. Solved in class: Answer: 2e14.A charged particle with a charge-to-mass ratio of q/m5.7 108C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.72 T. How much time does it take for the particle to complete one revolution? Solved in class: Answer: 1.5x10-8s 15.A charged particle enters a uniform magnetic field and follows the circular path shown in the drawing. (a)Is the particle positively or negatively charged? Why? (b)The particle’s speed is 140 m/s, the magnitude of the magnetic field is 0.48 T, and the radius of the path is 960 m. Determine the mass of the particle, given that its charge has a magnitude of 8.2 104C. Problem 15 a) negative b) 438.210C0.48 T960 m2.710kg140 m/sq Brmv
16.A proton is projected perpendicularly into a magnetic field that has a magnitude of 0.50 T. The field is then adjusted so that an electron will follow a circular path of the same radius when it is projected perpendicularly into the field with the same velocity that the proton had.
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