A proton is accelerated from rest through a potential difference of V = 150 V. It then enters a region of uniform magnetic field where it moves in a circular path of radius 12 cm and hits the screen 24 cm from the entry point. a) What is the magnitude of the magnetic field? b) Suppose that a “He nucleus is accelerated through the same potential and sent into the same magnetic field. A *He nucleus has twice the charge of a proton and four times its mass. How far from the entry point does the alpha particle hit the screen? O O o o O o o o O O O O o o' o o o io O O

Magnetic resonance imaging (MRI) is one of the most useful and rapidly growing medical imaging tools. It non-invasively produces two-dimensional and three-dimensional images of the body that provide important medical information with none of the hazards of x-rays. MRI is based on an effect called nuclear magnetic resonance (NMR) in which an externally applied magnetic field interacts with the magnetic fields of nuclei of certain atoms, particularly those of hydrogen (protons). The external magnetic field is created by a large coil. This field interacts with the hydrogen atoms in the patient's body to form images. a) To see why an MRI utilizes iron to increase the magnetic field created by a coil, calculate the current needed in a 420-loop-per-meter circular coil 0.66 m in radius to create a 1.3 T field (typical of an MRI instrument) at its center with no iron present. /= A Introducing ferromagnetic materials inside coils greatly increases the magntic field inside the coil for a small…

4. An ionized deuteron (a particle with a +e charge) passes through a velocity selector whose magnetic and electric fields have magnitudes of 40.0 mT and 6.70 kV/m, respectively. Find the speed of the ion to undeflected. m/s VISS (9JS 09.09 $$160 ssfove through the selector

What is the force acting on a 1.6(10)–19 C charge when it is moving at 3(10)7m/s perpendicular to a magnetic field whose strength is 0.02 T?   What is the radius of the particle’s trajectory if the mass of the particle is 3.3(10)-27 kg?