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28. A cyclotron is a particle accelerator that is constructed of two hollow metal shells shaped like D's in a perpendicular magnetic field created by magnets, as shown below."The entire apparatus is placed in a vacuum. An alternating voltage is maintained across the D separation, Negatively charged particles such as electrons are injected near the centre of the D's and travel in circular paths caused by the external perpendicular magnetic field. The frequency of the alternating voltage is adjusted to increase the speed of the particles each time they move across the Ds' separation. Upper magnet Path of electrons D separation Cyclotron Specifications magnetic field intensity = city = 0 249 T maximum voltage across D separation = 20,000 V fon = 5.00 cm D separation = Determine the direction of the magnetic field needed to cause the electrons to circle in the direction shown. from the upper magnet to the lower magnet O from the right hand side of the page to the left hand side of the page from the lower magnet from the left hand side of t he page to the right hand side of the page