Horizontal electric power lines supported by vertical poles can carry large currents. assume that earth’s magnetic field runs parallel to the surface of the ground from south to north with a magnitude of 0.50×10−4 t and that the supporting poles are 38 m apart. 1) find the magnitude of the force that earth’s magnetic field exerts on a 38-m segment of wire carrying 95 a if the current runs from north to south. (express your answer to two significant figures.)

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?