5. Consider an electron moving in the +x direction with speed vx, in a uniform magnetic field B = B ˆz. (a) What type of trajectory does the electron take? What happens qualitatively to its velocity in the x direction as its velocity in the y direction increases? How does its kinetic energy change? (b) Now imagine that the electron is in a conducting material that obeys Ohm’s law, and is subject to an electric field that ensures that its x velocity is always exactly vx. What type of trajectory does it take? What happens to its velocity in the x direction as its velocity in the y direction increases? How does its kinetic energy change? (c) When the electron’s energy changes, what force does the work? Ok, really just wanna confirm if my answers are correct. a). Clockwise circular trajectory, as Vy increases Vx decreases to the total veloty remains constant, kinetic energy remains constant. b). Clockwise spiral trajectory, Vx remains constant, total velocity increases and therefore kinetic energy increases. Not too sure if the trajecoty is correct though. Since Vx is constant, then it V total may return to Vx then its directly on the x-axis, and then it woulb be like a harmonic oscillator in the y direction. c). The electric field.