A hollow conducting sphere has an internal radius of r1 = 1.9 cm and an external radius of r2 = 3.1 cm. The sphere has a net charge of Q = 1.9 nC. a) What is the magnitude of the electric field in the cavity at the center of the sphere, in newtons per coulomb?
b) What is the magnitude of the field, in newtons per coulomb, inside the conductor, when r1 < r < r2?
c) What is the magnitude of the field, in newtons per coulomb, at a distance r = 5.9 m away from the center of the sphere?

Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34×10−27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 μa how many deuterons strike the target each second?