What is the kinetic energy of the electrons

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A vacuum tube contains two axial cylinders as shown in the figure below. The potential difference between these cylinders is 500V. Some electrons are released from the inner cylinder and are accelerated by the electric field toward the outer cylinder; a small current thereby travels through the tube. Suppose that a uniform magnetic field is set up parallel to the axis of the tube. This curves the trajectories of the electrons, and at a critical magnetic field, the electrons will no longer reach the outer cylinder, and the current ceases to flow. What is the kinetic energy of the electrons that hit the outer cylinder at a magnetic field just below the critical value?

Reference no: EM132513179

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