ecall that we can analyze the nature of particles with a velocity selector and mass spectrometer. Suppose we know that the charge of the particle we’re experimenting with is that of an electron but we don’t know their speed and we don’t know their mass. a) The velocity selector is constructed to have a magnetic field of 0.15T pointing into the paper plane and an electric field of 70N/C pointing downward. What is the speed of negatively charged particles if they don’t experience any deflection? b) Suppose that those particles that are not deflected then enter a magnetic field of 3T pointing into the plane (no electric field). If we measure a diameter of the circular orbit in this magnet field of 1cm what is the mass of the particle?

A proton, that is accelerated from rest through a potential of 14.0 kV enters the velocity filter, consisting of a parallel-plate capacitor and a magnetic field, shown below. 112 The E-field between the parallel capacitor plates is 1.1.105 N/C. What B-field is required so that the protons are not deflected? (Ignore relativistic effects for high velocities.) Submit Answer Tries 0/12 Send Feedback

J. J. Thomson is best known for his discoveries about the nature of cathode rays. His other important contribution was the invention, together with one of his students, of the mass spectrometer, a device that measures the ratio of mass m to (positive) charge q of an ion. The spectrometer consists of two regions as shown in the figure. (Figure 1) In the first region an electric field accelerates the ion and in the second the ion follows a circular arc in a magnetic field. The radius of curvature of the arc can be measured and then the m/q ratio can be Figure V B • Part A Find the ratio m/q for this particle. Express your answer numerically in kilograms per coulomb. View Available Hint(s) After being accelerated to a speed of 1.21x105 m/s, the particle enters a uniform magnetic field of strength 0.700 T and travels in a circle of radius 35.0 cm (determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q. m/q= Submit…

From the given below statements, identify the True/False statements, based on the formula for magnetic field, B= 2. V B².² equation for calculating e/m given as e m Select one: O 1. Increasing the current passing through Helmholtz coils will decrease radius of the path that beam of electron follows at constant voltage. 2. Increasing the current passing through Helmholtz coils will decrease radius of the Helmholtz coils. False 1 True True False D 2 False 2 False 2 True Po-N-IH 2 True R and