In the figure, a particle moves along a circle in a region of uniform magnetic field of magnitude B = 4.5 mT. The particle is either a proton or an electron (you must decide which). It experiences a magnetic force of magnitude 3.0 x 10-15 N. What are (a) the particle's speed, (b) the radius of the circle, and (c) the period of the motion? OBA certain commercial mass spectrometer is used to separate uranium ions of mass 3.92 x 10'25 kg and charge 3.20 X 10'19 C from related species. The ions are accelerated through a potential difference of 129 kV and then pass into a uniform magnetic eld, where they are bent in a path of radius 1.21 m. After traveling through 180 and passing through a slit of width 1.26 mm and height 1.28 cm, they are collected in a cup. (a) What is the magnitude of the (perpendicular) magnetic eld in the separator? If the machine is used to separate out 0.898 mg of material per hour, calculate (b) the current of the desired ions in the machine and (c) the thermal energy produced in the cup in 0.944 h. A horizontal power line carries a current of 6690 A from south to north. Earth's magnetic field (60.5 uT) is directed toward the north and is inclined downward at 60.0 to the horizontal. Find the (a) magnitude and (b) direction of the magnetic force on 150 m of the line due to Earth's field